{"title":"SLU-PP-332","description":"\u003cp\u003eSLU-PP-332, also written SLU PP 332 (sometimes misspelt SLU-PP-322) and called an exercise mimetic or exercise in a pill in the press, is a synthetic small-molecule agonist of the oestrogen-related receptors ERR alpha, beta and gamma, not a peptide. It is one of the newest and least characterised research compounds, with data from mice and cultured cells, including human muscle cells, but none from people. This page lists every brand of SLU-PP-332 stocked at Free Muscle, compared on strength per capsule, capsules per pack and whether a batch certificate is available. Sold for laboratory research to adults only.\u003c\/p\u003e\n\n\u003ch2\u003eWhat is SLU-PP-332?\u003c\/h2\u003e\n\u003cp\u003eThe oestrogen-related receptors are three orphan nuclear receptors, ERR alpha, ERR beta and ERR gamma. Despite the name they do not bind oestrogen. They regulate the expression of genes for mitochondrial biogenesis, fatty acid oxidation and oxidative metabolism, and their activity rises in skeletal muscle in response to endurance exercise. SLU-PP-332 was developed at Saint Louis University, which is where the SLU prefix comes from, as a pan-agonist that switches on all three receptors. It was designed as a tool compound to test whether pharmacological activation of ERRs could reproduce part of the adaptive response to aerobic training.\u003c\/p\u003e\n\u003cp\u003eThe first pharmacology paper appeared in 2023, so the entire literature is only a few years old and comes largely from the discovering group and its collaborators. Follow-up work has explored the compound in mouse models of obesity and metabolic syndrome, heart failure and kidney ageing, and a successor compound, SLU-PP-915, has since been described. SLU-PP-332 has never entered a clinical trial. There is no human pharmacokinetic, safety or efficacy data of any kind, and it is not approved as a medicine anywhere in the world. Anyone claiming a human result for this compound is not citing published evidence.\u003c\/p\u003e\n\n\u003cp\u003eChemically it is an acylhydrazone. A certificate of analysis may name it by the chemical name or CAS number below, from PubChem (checked October 2026), rather than as SLU-PP-332.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eIdentifier\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemical name\u003c\/td\u003e\n\u003ctd\u003e4-hydroxy-N'-(naphthalen-2-ylmethylene)benzohydrazide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCAS number\u003c\/td\u003e\n\u003ctd\u003e303760-60-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePubChem CID\u003c\/td\u003e\n\u003ctd\u003e5338394\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormula\u003c\/td\u003e\n\u003ctd\u003eC18H14N2O2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolar mass\u003c\/td\u003e\n\u003ctd\u003e290.3 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eIn the developers' cell assays it activated ERR alpha at the lowest concentration (EC50 98 nM), then ERR beta (230 nM) and ERR gamma (430 nM): a pan-agonist with a modest ERR alpha preference. These are cell culture figures, not effects in animals or people.\u003c\/p\u003e\n\u003cp\u003eRoute matters for a capsule listing. The 2023 exercise study and the 2024 heart failure study gave it to mice by intraperitoneal injection, and its developers reported in 2026 that it is not bioavailable by mouth (see below). No study has tested it in capsule form, and we make no claim about what the capsules listed here do.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the published research reports\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExercise response and endurance in mice (2023).\u003c\/strong\u003e In cultured muscle cells and in mice, SLU-PP-332 activated ERR alpha-dependent gene programmes resembling the acute response to aerobic exercise. Treated mice, injected intraperitoneally, showed a higher proportion of oxidative type IIa muscle fibres and ran further and for longer in treadmill tests than controls. The effect was lost in mice lacking ERR alpha. A 10-day screen found no overt toxicity (normal blood counts and electrolytes, no significant change in creatine kinase), a short check rather than a toxicology study; long-term safety was not addressed. Three authors declared stock in Myonid Therapeutics, an ERR therapeutics company. Billon C, et al. Synthetic ERR alpha\/beta\/gamma agonist induces an ERR alpha-dependent acute aerobic exercise response and enhances exercise capacity. ACS Chem Biol. 2023;18(4):756-771. PMID: 36988910.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetabolic syndrome models in mice (2024).\u003c\/strong\u003e In diet-induced and genetically obese mice, treatment increased energy expenditure and fat oxidation and reduced fat mass, with improved insulin sensitivity, without a change in food intake. The authors describe the changes as resembling the effects of exercise training. The work remained entirely in rodents. Billon C, et al. A synthetic ERR agonist alleviates metabolic syndrome. J Pharmacol Exp Ther. 2024;388(2):232-240. PMID: 37739806.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeart, kidney and human muscle cells (2023 to 2025).\u003c\/strong\u003e In mice with pressure-overload heart failure, SLU-PP-332 and SLU-PP-915 improved ejection fraction, reduced fibrosis and increased survival (Xu et al., 2024; one author co-founded Pelagos Pharmaceuticals). In 21-month-old mice, eight weeks of treatment reversed the age-related rise in albuminuria, podocyte loss and inflammatory cytokines (Wang et al., 2023). Muscle cells from ten inactive women, treated in a dish, showed lower markers of oxidative stress and senescence (Bonanni et al., 2025); no person received the compound. Xu W, et al. Novel pan-ERR agonists ameliorate heart failure through enhancing cardiac fatty acid metabolism and mitochondrial function. Circulation. 2024;149(3):227-250. PMID: 37961903. Wang XX, et al. Estrogen-related receptor agonism reverses mitochondrial dysfunction and inflammation in the aging kidney. Am J Pathol. 2023;193(12):1969-1987. PMID: 37717940. Bonanni R, et al. Targeting ERRs to counteract age-related muscle atrophy associated with physical inactivity: a pilot study. Front Physiol. 2025;16:1616693. PMID: 40692696.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetabolism and detection for anti-doping (2026).\u003c\/strong\u003e Two anti-doping laboratories have mapped its metabolism with human liver preparations and mass spectrometry: the Cologne group found nine metabolites of SLU-PP-332 and described it and SLU-PP-915 as having doping potential, and the UCLA Olympic Analytical Laboratory found 22, naming the most abundant as targets for doping control. This is detection work and says nothing about efficacy or safety. Moller T, et al. In vitro metabolism and analytical characterization of SLU-PP-332 and SLU-PP-915: novel pan-ERR agonists with doping potential. Rapid Commun Mass Spectrom. 2026;40(8):e70039. PMID: 41588687. Avliyakulov NK, et al. Analysis and identification of in vitro metabolites of exercise mimetic SLU-PP-332 ERR alpha\/beta\/gamma agonist for doping-control purposes. Drug Test Anal. 2026;18(3):439-450. PMID: 41688415.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOral activity and a successor compound (2026).\u003c\/strong\u003e Writing about their earlier compound, the developers stated that SLU-PP-332 is not orally bioavailable, then described SLU-PP-915, a chemically distinct pan-ERR agonist that worked in mice when given by mouth. The senior author is listed as an inventor of SLU-PP-915, which the university owns as intellectual property, and holds stock in Myonid Therapeutics and Pelagos Pharmaceuticals, both developing ERR agonists. Billon C, et al. An orally active estrogen receptor-related receptor agonist, SLU-PP-915, enhances aerobic exercise capacity. J Pharmacol Exp Ther. 2026;393(1):103787. PMID: 41421047.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEvery efficacy result above comes from mice or from cells in culture, most of it from the developers and their collaborators, and the doses were set per kilogram of animal body weight in ways that do not translate to a capsule. Nothing is known about human tolerability, off-target effects or long-term exposure. None of the above is a claim about any product on this page.\u003c\/p\u003e\n\n\u003ch2\u003eBrands of SLU-PP-332 we stock\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBioLab Metabolic Boost (SLU-PP-332) 100 mcg, 60 capsules.\u003c\/strong\u003e 100 micrograms per capsule, 60 capsules, 6 mg of compound per pack. \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-100-mcg-60-caps\"\u003eView BioLab 100 mcg\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBioLab Metabolic Boost (SLU-PP-332) 200 mcg, 60 capsules.\u003c\/strong\u003e 200 micrograms per capsule, 60 capsules, 12 mg per pack. \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-200-mcg-60-caps\"\u003eView BioLab 200 mcg\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBioLab Metabolic Boost (SLU-PP-332) 500 mcg, 60 capsules.\u003c\/strong\u003e 500 micrograms per capsule, 60 capsules, 30 mg per pack. \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-500-mcg-60-caps\"\u003eView BioLab 500 mcg\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThoroughbred Labs SLU-PP-332, 60 capsules.\u003c\/strong\u003e Capsule form, 60 capsules per pack. Thoroughbred Labs states 250 mcg per capsule, which is 15 mg per pack. \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-slu\"\u003eView Thoroughbred Labs SLU-PP-332\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBoth brands are third-party manufacturers. For each, a batch certificate of analysis is shown on the listing only where the manufacturer has supplied one for the batch we hold, and is not shown otherwise. Free Muscle does not currently make its own SLU-PP-332.\u003c\/p\u003e\n\u003ch3\u003eHow to compare them\u003c\/h3\u003e\n\u003cp\u003eThese are microgram strengths, so the arithmetic matters more than usual. Multiply micrograms per capsule by capsules per pack to get total compound, then divide the price by that figure for a cost per milligram. The 100 mcg and 500 mcg BioLab packs contain the same number of capsules but differ five-fold in compound. Where a listing does not state a strength, treat the pack as unquantified until you have seen the certificate. Then check who tested the batch, the method and whether the batch number matches the pack. Check the units too: certificates may report milligrams where labels use micrograms (1 mg is 1,000 mcg). The comparison table above this guide already shows total milligrams and price per milligram for each listing.\u003c\/p\u003e\n\n\u003ch2\u003eBatch testing and certificates of analysis\u003c\/h2\u003e\n\u003cp\u003eA certificate of analysis (COA) for a research compound reports identity, confirming that the material is SLU-PP-332, and purity, the proportion of the sample that is the compound, typically by HPLC with mass spectrometry to confirm identity. A good certificate names the laboratory, method, batch number and date. For a compound this new, identity testing is especially important. A mass spectrometry identity result should match a molecule of about 290 g\/mol, and the certificate may use the chemical name or CAS number shown above; a peptide content figure does not apply to this small molecule.\u003c\/p\u003e\n\u003cp\u003eFor BioLab and Thoroughbred Labs we show a certificate only where the manufacturer supplies one for the batch we hold. A generic PDF with no batch number, no date or no named laboratory is not a batch certificate. Free Muscle brand products are assayed by Janoshik Analytical for every batch, with certificates available by email on request. See \u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003eour lab testing page\u003c\/a\u003e for how to read one.\u003c\/p\u003e\n\n\u003ch2\u003eWhere to buy SLU-PP-332 in the UK: how to check a supplier\u003c\/h2\u003e\n\u003cp\u003eWhichever shop you buy SLU-PP-332 from, check these five points before you order:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eA batch number and a certificate for that batch.\u003c\/strong\u003e The pack should carry a batch number, and the seller should be able to show a certificate of analysis for that same batch from a named laboratory, with the test date. For BioLab and Thoroughbred Labs, a certificate is shown where the brand supplies one for the batch we hold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe strength per capsule and the capsule count.\u003c\/strong\u003e With both figures you can work out the total milligrams in the pack and the price per milligram; the comparison table above does this for every listing here that states both. If a listing does not state one of them, ask the seller before you order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResearch-use labelling and an age check.\u003c\/strong\u003e A research compound should be sold for laboratory research use only, not for human consumption, to adults aged 18 or over, with no dosing or usage advice. That is how every listing here is sold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrices in pounds sterling and tracked UK dispatch.\u003c\/strong\u003e UK delivery from us is free and tracked on every order, with no minimum spend, and usually arrives 2-3 working days after dispatch; orders placed before 2pm Monday to Friday are processed the same working day.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA clear returns policy.\u003c\/strong\u003e Unopened items can be returned to us within 30 days.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eBrands on this page: \u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eBioLab\u003c\/a\u003e and \u003ca href=\"\/en-ro\/collections\/brand-thoroughbred-labs\"\u003eThoroughbred Labs\u003c\/a\u003e. The \u003ca href=\"\/en-ro\/blogs\/news\/how-to-choose-a-sarms-supplier-uk-checklist\"\u003eUK supplier checklist\u003c\/a\u003e and \u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003ehow we test\u003c\/a\u003e go into more detail.\u003c\/p\u003e\n\n\u003ch2\u003eLegal status in the UK\u003c\/h2\u003e\n\u003cp\u003eWhere SLU-PP-332 stands, checked in October 2026:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedicines:\u003c\/strong\u003e not a licensed medicine in the UK and not approved as a medicine anywhere; the MHRA has not assessed it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControlled drugs:\u003c\/strong\u003e not a controlled drug under the Misuse of Drugs Act 1971.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFood:\u003c\/strong\u003e not an authorised food supplement or a permitted novel food.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClinical trials:\u003c\/strong\u003e none published and none registered on ClinicalTrials.gov.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSport:\u003c\/strong\u003e covered by section S0 of the WADA Prohibited List, and so prohibited at all times (see below).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply:\u003c\/strong\u003e sold by Free Muscle for laboratory research to adults aged 18 or over, not for human consumption.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor sport, SLU-PP-332 is not named on the 2026 WADA Prohibited List, but that does not make it permitted. Section S0 prohibits at all times, in and out of competition, any pharmacological substance that no other section addresses and that has no current approval for human therapeutic use, such as drugs in pre-clinical development; SLU-PP-332 is approved nowhere. The metabolic modulators section, S4.4, lists AMPK activators, PPAR delta agonists and Rev-erb alpha agonists alongside insulins, meldonium and trimetazidine, but not ERR agonists. In 2026 two anti-doping laboratories published metabolites to target for its detection. Our \u003ca href=\"\/en-ro\/blogs\/news\/slu-pp-332-and-5-amino-1mq-research-guide\"\u003eSLU-PP-332 and 5-Amino-1MQ research guide\u003c\/a\u003e covers both compounds in more depth.\u003c\/p\u003e\n\n\u003ch2\u003eStorage and handling\u003c\/h2\u003e\n\u003cp\u003eKeep the container tightly sealed in a cool, dry place away from direct light and heat. Keep the batch number with the material, do not transfer capsules into unlabelled containers, and handle in line with good laboratory practice. Keep out of the reach of children and animals.\u003c\/p\u003e\n\n\u003ch2\u003eDelivery and returns\u003c\/h2\u003e\n\u003cp\u003eFree Muscle is the trading name of FreeMuscle, a business registered in Andorra, with UK operations and dispatch in Scunthorpe. Every order ships with free tracked UK delivery in plain packaging. Orders placed before 2pm Monday to Friday are processed the same working day. EU delivery takes 3 to 7 working days. Unopened items can be returned within 30 days. Customers must be 18 or over. See \u003ca href=\"\/en-ro\/pages\/shipping\"\u003eshipping\u003c\/a\u003e and \u003ca href=\"\/en-ro\/pages\/guarantee\"\u003eour guarantee\u003c\/a\u003e for the full terms.\u003c\/p\u003e\n\n\u003ch2\u003eRelated reading\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/slu-pp-332-and-5-amino-1mq-research-guide\"\u003eSLU-PP-332 and 5-Amino-1MQ: what the mouse data show\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/sr9009-stenabolic-research-guide\"\u003eSR9009 (Stenabolic): REV-ERB research and the bioavailability problem\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/how-to-read-a-certificate-of-analysis\"\u003eHow to Read a Certificate of Analysis (COA)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/price-per-mg-compare-sarms-peptides\"\u003ePrice per milligram: the only honest way to compare\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/how-to-choose-a-sarms-supplier-uk-checklist\"\u003eHow to choose a SARMs or peptide supplier in the UK: a checklist\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRelated collections: \u003ca href=\"\/en-ro\/collections\/5-amino-1mq\"\u003e5-Amino-1MQ\u003c\/a\u003e, \u003ca href=\"\/en-ro\/collections\/cardarine\"\u003eCardarine (GW-501516)\u003c\/a\u003e, \u003ca href=\"\/en-ro\/collections\/sr9009\"\u003eSR9009 (Stenabolic)\u003c\/a\u003e, \u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eBioLab\u003c\/a\u003e, \u003ca href=\"\/en-ro\/collections\/brand-thoroughbred-labs\"\u003eThoroughbred Labs\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eResearch compounds sold by Free Muscle are supplied for laboratory research use only and are not for human consumption. They are not authorised as medicines by the MHRA, EMA or FDA, are not food supplements, and are sold only to adults aged 18 or over. Nothing on this page is medical or dosing advice.\u003c\/em\u003e\u003c\/p\u003e","products":[{"product_id":"biolab-metabolic-boost-slu-pp-332-100-mcg-60-caps","title":"BioLab Metabolic Boost (SLU-PP-332) 100 mcg, 60 caps","description":"\u003cp\u003e\u003cstrong\u003eBioLab Metabolic Boost (SLU-PP-332) 100 mcg, 60 caps\u003c\/strong\u003e is the lowest-strength BioLab listing of SLU-PP-332, labelled at 100 mcg (0.1 mg) per capsule, 60 capsules per pack. \"Metabolic Boost\" is BioLab's trade name, not a description of any effect, and we make no claim that this product does anything in people. It is supplied through the \u003ca href=\"\/en-ro\/pages\/muscle-market\"\u003eMuscle Market\u003c\/a\u003e range for laboratory research only, is not for human consumption, and is sold to adults aged 18 and over.\u003c\/p\u003e\n\u003ch2\u003eAbout SLU-PP-332\u003c\/h2\u003e\n\u003cp\u003eSLU-PP-332, also written SLU PP 332, is a synthetic pan-agonist of the oestrogen-related receptors ERR alpha, beta and gamma. These are orphan nuclear receptors, unrelated to the oestrogen receptor despite the name, that regulate mitochondrial biogenesis and oxidative metabolism in muscle and heart. It was developed by Thomas Burris, John Walker and colleagues, the SLU prefix referring to Saint Louis University, and was first reported as an ERR agonist in 2023. It is behind the exercise-in-a-pill headlines of the last few years.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eIdentifier\u003c\/th\u003e\n\u003cth\u003eSLU-PP-332\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCAS number\u003c\/td\u003e\n\u003ctd\u003e303760-60-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular formula\u003c\/td\u003e\n\u003ctd\u003eC18H14N2O2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular weight\u003c\/td\u003e\n\u003ctd\u003e290.3 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIUPAC name\u003c\/td\u003e\n\u003ctd\u003e4-hydroxy-N-[(E)-naphthalen-2-ylmethylideneamino]benzamide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInChIKey\u003c\/td\u003e\n\u003ctd\u003eRNZIMBFHRXYRLL-XDHOZWIPSA-N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePubChem CID\u003c\/td\u003e\n\u003ctd\u003e5338394\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eChemically it is an acyl hydrazone: a 4-hydroxybenzoyl unit joined to a naphthalene ring through a carbon-nitrogen double bond. It is a small organic molecule, not a peptide, although shops and search engines often file it under peptides.\u003c\/p\u003e\n\u003ch3\u003eWhat the published research reports\u003c\/h3\u003e\n\u003cp\u003eIn the 2023 ACS Chemical Biology paper, SLU-PP-332 increased mitochondrial function and cellular respiration in a skeletal muscle cell line. Mice given the compound showed more type IIa oxidative muscle fibres, a gene expression pattern in muscle resembling the acute response to aerobic exercise, and greater running endurance; the authors reported that ERR alpha activation was critical for the endurance effect. A 2024 follow-up in diet-induced obese and genetically obese (ob\/ob) mice reported increased energy expenditure and fatty acid oxidation, less fat mass accumulation and improved insulin sensitivity. Authors of both papers declared shareholdings in a company developing ERR-based therapeutics.\u003c\/p\u003e\n\u003cp\u003eIn a 2026 paper the same group described a chemically distinct successor, SLU-PP-915, and stated plainly that SLU-PP-332 improves aerobic performance in mice but lacks oral bioavailability; the newer molecule was characterised because it is active by mouth. In that paper SLU-PP-332 was given by intraperitoneal injection, and it too carries a declared conflict of interest: the senior author is named as inventor on the university's intellectual property covering SLU-PP-915 and holds shares in companies developing ERR agonists. There is no human data of any kind, no human pharmacokinetic study, and no safety study in people. It is one of the newest compounds in this market and one of the least characterised. Nothing above is a claim about this product.\u003c\/p\u003e\n\u003ch2\u003eThis listing\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eBioLab\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompound: SLU-PP-332\u003c\/li\u003e\n\u003cli\u003eForm: Capsules\u003c\/li\u003e\n\u003cli\u003ePack size: 60 capsules\u003c\/li\u003e\n\u003cli\u003eStrength: 100 mcg (0.1 mg) per capsule, as printed on the BioLab label\u003c\/li\u003e\n\u003cli\u003eTotal in pack: 6 mg (100 mcg x 60 capsules)\u003c\/li\u003e\n\u003cli\u003eBatch certificate of analysis: shown where BioLab supplies one for the batch we hold\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBioLab also lists the compound at \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-200-mcg-60-caps\"\u003e200 mcg per capsule\u003c\/a\u003e (12 mg per pack) and \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-500-mcg-60-caps\"\u003e500 mcg per capsule\u003c\/a\u003e (30 mg per pack), each in 60 capsules, and \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-slu\"\u003eThoroughbred Labs SLU-PP-332\u003c\/a\u003e is a separate 60-capsule listing labelled at 250 mcg per capsule, or 15 mg per pack. Total milligrams per pack is the fair basis for comparison; our \u003ca href=\"\/en-ro\/blogs\/news\/price-per-mg-compare-sarms-peptides\"\u003eprice per milligram guide\u003c\/a\u003e sets out the method.\u003c\/p\u003e\n\u003ch2\u003eSLU-PP-332 in the UK: buying, legal status and what to check\u003c\/h2\u003e\n\u003cp\u003eSearches such as \"SLU PP 332 UK buy\", \"UK source\" and \"UK reviews\" ask two things: what the law allows, and how to tell a documented listing from an undocumented one.\u003c\/p\u003e\n\u003ch3\u003eThe legal position\u003c\/h3\u003e\n\u003cp\u003eSLU-PP-332 is not a licensed medicine in the UK, has not been assessed by the MHRA, and is not an authorised food supplement or novel food. It is not a controlled drug. No licensed medicine containing it exists anywhere, so it is not something a UK pharmacy supplies as a medicine, and listings on general marketplaces that present it as a supplement describe something it cannot lawfully be sold as. What remains is supply for laboratory research to adults aged 18 and over, which is the only basis for this listing; it is not for human consumption. In sport it is prohibited at all times: as a substance with no current approval for human therapeutic use it is caught at minimum by WADA section S0 (non-approved substances), and anti-doping scientists describe exercise mimetics and metabolic modulators as prohibited. Anyone subject to anti-doping rules should consult the current list. Our \u003ca href=\"\/en-ro\/blogs\/news\/what-are-sarms-the-2026-research-guide\"\u003eresearch guide\u003c\/a\u003e covers the wider legal picture.\u003c\/p\u003e\n\u003ch3\u003eWhat a documented UK listing shows\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA named brand and a reachable UK seller\u003c\/strong\u003e, so there is someone accountable for the pack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrength per capsule with its unit\u003c\/strong\u003e, micrograms or milligrams, plus the capsule count, so the total can be checked. Confusing mcg with mg is a thousand-fold error.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA lot number on the container\u003c\/strong\u003e and a certificate carrying the same number, or a plain statement that none is held.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResearch-use terms\u003c\/strong\u003e: 18+ only, no directions for use, and no talk of fat loss or endurance. Calling SLU-PP-332 an \"exercise pill\" is a claim no regulator has assessed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow this listing compares\u003c\/h3\u003e\n\u003cp\u003eThe seller is named: FreeMuscle, registered in Andorra, with UK operations and dispatch in Scunthorpe. Every UK order travels by free tracked delivery in plain packaging, orders placed before 2pm Monday to Friday are processed the same working day, EU delivery takes 3-7 working days, and unopened items may be returned within 30 days (\u003ca href=\"\/en-ro\/pages\/shipping\"\u003edelivery\u003c\/a\u003e, \u003ca href=\"\/en-ro\/pages\/guarantee\"\u003ereturns\u003c\/a\u003e). BioLab is named and states a strength, so the total per pack can be worked out. The certificate point depends on what BioLab has supplied for the batch in stock, covered below. We do not publish outcome reports. A fuller checklist is in \u003ca href=\"\/en-ro\/blogs\/news\/how-to-choose-a-sarms-supplier-uk-checklist\"\u003ehow to choose a UK supplier\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eCapsules compared with other forms\u003c\/h2\u003e\n\u003cp\u003e\"SLU-PP-332 capsules\" and \"SLU-PP-332 injectable\" are both common searches, and the published literature bears directly on the difference. Every in vivo result summarised above came from mice given the compound by injection. The developers themselves describe SLU-PP-332 as lacking oral bioavailability, which is why they went on to make SLU-PP-915. No study has measured what swallowed SLU-PP-332 does in an animal or a person, so we make no comparison of forms on effect.\u003c\/p\u003e\n\u003cp\u003eThe oral-peptide argument does not apply here. SLU-PP-332 is not broken down by digestive proteases, because it is not a peptide; the developers report a bioavailability problem without, in the abstract, giving its cause. For peptides the issue is different, as our article \u003ca href=\"\/en-ro\/blogs\/news\/do-oral-peptides-work\"\u003edo oral peptides work\u003c\/a\u003e explains.\u003c\/p\u003e\n\u003cp\u003eWhere the forms do differ measurably is content and stability:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapsules\u003c\/strong\u003e at 100 mcg hold a very small quantity of active blended into a much larger mass of filler. Content per capsule depends on how evenly that blend was mixed, which is why a content-per-capsule result on the certificate matters more at micrograms than at milligrams.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiquids and injectable research products\u003c\/strong\u003e rely on the compound staying dissolved and intact in the solvent. An acyl hydrazone sitting in water is exposed to hydrolysis, and each measured volume is only as accurate as the pipette.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSLU-PP-332 compared with cardarine\u003c\/h2\u003e\n\u003cp\u003eCardarine (GW-501516) is the related compound most often searched alongside SLU-PP-332, because both have been called exercise mimetics. They act on different nuclear receptors and have very different histories.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePoint\u003c\/th\u003e\n\u003cth\u003eSLU-PP-332\u003c\/th\u003e\n\u003cth\u003eCardarine (GW-501516)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTarget\u003c\/td\u003e\n\u003ctd\u003eERR alpha, beta and gamma (agonist)\u003c\/td\u003e\n\u003ctd\u003ePPAR-delta (selective agonist)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormula\u003c\/td\u003e\n\u003ctd\u003eC18H14N2O2\u003c\/td\u003e\n\u003ctd\u003eC21H18F3NO3S2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular weight\u003c\/td\u003e\n\u003ctd\u003e290.3 g\/mol\u003c\/td\u003e\n\u003ctd\u003e453.5 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCAS number\u003c\/td\u003e\n\u003ctd\u003e303760-60-3\u003c\/td\u003e\n\u003ctd\u003e317318-70-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eSaint Louis University, reported as an ERR agonist in 2023\u003c\/td\u003e\n\u003ctd\u003eLigand Pharmaceuticals and GlaxoSmithKline, 1990s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHuman data\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eSmall trials of two to six weeks on blood lipids\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDevelopment\u003c\/td\u003e\n\u003ctd\u003eAcademic, preclinical only\u003c\/td\u003e\n\u003ctd\u003eDiscontinued by GSK in 2007 after rodent carcinogenicity findings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUK status\u003c\/td\u003e\n\u003ctd\u003eUnlicensed research compound\u003c\/td\u003e\n\u003ctd\u003eUnlicensed research compound\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWADA\u003c\/td\u003e\n\u003ctd\u003eProhibited at all times (S0 non-approved substances at minimum)\u003c\/td\u003e\n\u003ctd\u003eS4, metabolic modulators (PPAR-delta agonists)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eOn mechanism, both receptors sit in the cell nucleus and switch on genes for fat oxidation and mitochondrial function in muscle, but they are separate proteins with separate ligands, so one compound is not a variant of the other. On evidence, cardarine is the better documented and the more troubling: its short human trials measured changes in blood lipids, and its pharmaceutical development stopped after long-term rodent studies reported tumours in several organs. WADA issued a public warning about it in 2013. SLU-PP-332 has no human trials, no long-term toxicology and only a handful of mouse papers, so its absence of reported harms reflects an absence of study, not a clean record.\u003c\/p\u003e\n\u003cp\u003eOn regulation they converge: neither is licensed in the UK, neither may be sold for consumption, and both are prohibited at all times in sport, under different sections of the WADA list. No head-to-head study exists, and we do not rank research compounds by effect. The brands held are in the \u003ca href=\"\/en-ro\/collections\/cardarine\"\u003ecardarine collection\u003c\/a\u003e, and the full development history is in \u003ca href=\"\/en-ro\/blogs\/news\/cardarine-gw-501516-what-happened-in-development\"\u003ecardarine (GW-501516): why development stopped\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eReading the certificate of analysis for this product\u003c\/h2\u003e\n\u003cp\u003eBioLab is a third-party brand in the Muscle Market range, so the testing position differs from our own label. Every Free Muscle-brand batch is assayed by Janoshik Analytical, an independent laboratory, with the certificate sent on request by email. For BioLab products we show a certificate of analysis only where BioLab supplies one for the specific batch we hold. A generic PDF with no batch number is not a batch certificate, and we do not present one as such. You can contact us with the product name and lot number to ask what is held for that batch. The certificate pictured in this listing's gallery was issued in October 2024 by Analiza Białek sp. z o.o., a registered testing company in Wrocław, Poland. It names the sample BIOLAB METABOLIC BOOST 100MCG\/CAPS and reports 118.34 mcg per capsule by HPLC for a label figure of 100 mcg, with a stated error of plus or minus 0.5 mcg; BioLab quotes the same figure on its own page for this product. The purity and batch number fields are empty, and the sample is known only by a laboratory order reference and a picture of a tub with a shrink-sealed cap, so the result describes that sample rather than your lot. For that report, or any newer one, these are the lines to read:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdentity.\u003c\/strong\u003e HPLC confirms identity only indirectly, by matching a peak's retention time to a reference standard. LC-MS is firmer: SLU-PP-332 has a monoisotopic mass of about 290.11, so the protonated molecule should appear near m\/z 291.1.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurity (%).\u003c\/strong\u003e The share of the chromatogram taken by the main peak. For a hydrazone, small extra peaks can be the other geometric isomer or breakdown products (4-hydroxybenzohydrazide and 2-naphthaldehyde), which is useful context when purity falls short of the headline figure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContent per capsule.\u003c\/strong\u003e The line that tests the 100 mcg label. A purity figure alone says nothing about how much compound each capsule holds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBatch number.\u003c\/strong\u003e It must match the lot printed on the pack you have.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLaboratory and test date.\u003c\/strong\u003e They show who ran the analysis and how old the result is.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA missing field has a plain meaning. No identity result means nothing independent confirms the compound; no content result leaves the stated strength unverified; a different batch number means the certificate describes other material. \u003ca href=\"\/en-ro\/pages\/contact\"\u003eContact us\u003c\/a\u003e with the lot number, and see \u003ca href=\"\/en-ro\/blogs\/news\/how-to-read-a-certificate-of-analysis\"\u003ehow to read a certificate of analysis\u003c\/a\u003e and our \u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003elab tests page\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eDetection, sport and testing\u003c\/h2\u003e\n\u003cp\u003eSLU-PP-332 is prohibited at all times in sport (section S0 at minimum), and the anti-doping community has already started work on finding it. In a 2026 study from the UCLA Olympic Analytical Laboratory, researchers incubated the compound with pooled human liver S9 fractions and used liquid chromatography with high-resolution mass spectrometry to identify 22 metabolites: mono- and dihydroxylated forms, reduced dihydroxylated forms, and glucuronide and sulfate conjugates, some with hydroxylation of the naphthalene or phenolic ring. They named eight of the most abundant as candidate targets for doping control and noted that further work is needed to confirm the structures.\u003c\/p\u003e\n\u003cp\u003eThat is an in vitro result. No human excretion study of SLU-PP-332 has been published, so the accurate statement is: detectable in principle, window not established. Under strict liability an athlete is responsible for any prohibited substance found in their sample, whatever its source, so anyone subject to testing should treat any exposure as reportable. The current list and any updates are published by WADA each year.\u003c\/p\u003e\n\u003ch2\u003eStorage, stability and handling\u003c\/h2\u003e\n\u003cp\u003eNo stability study of SLU-PP-332 capsules has been published, so the expiry printed on the BioLab tub, where there is one, is the only stated limit. The chemistry still points to sensible practice. The hydrazone link is the part of the molecule most open to attack by water, and the reaction is faster in acidic conditions, so moisture is the first thing to keep out. The conjugated naphthalene system absorbs ultraviolet light, and compounds with this kind of carbon-nitrogen double bond can switch between geometric isomers under light, so the container should stay closed and out of sunlight.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStore the container shut, in its original packaging, somewhere with a steady temperature, low humidity and no direct light.\u003c\/li\u003e\n\u003cli\u003eA refrigerated container should warm up unopened first, otherwise moist air condenses on cold capsules the moment the lid comes off.\u003c\/li\u003e\n\u003cli\u003eWear gloves for any opened capsule, keep the work area free of food and drink, and store the pack where children and pets cannot reach it.\u003c\/li\u003e\n\u003cli\u003eTreat spent capsules and packaging residues as chemical waste rather than household rubbish or drain waste.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eGlossary\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOestrogen-related receptors (ERR)\u003c\/strong\u003e: three nuclear receptors, alpha, beta and gamma, that control genes for energy metabolism; they do not bind oestrogen.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrphan nuclear receptor\u003c\/strong\u003e: a receptor whose endogenous activating ligand was unknown when it was discovered.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePan-agonist\u003c\/strong\u003e: a compound that activates every member of a receptor family rather than one subtype.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExercise mimetic\u003c\/strong\u003e: a research label for a compound that reproduces part of the molecular response to exercise in cells or animals; it is not a finding in people.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOral bioavailability\u003c\/strong\u003e: the fraction of a swallowed dose that reaches the circulation unchanged.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcyl hydrazone\u003c\/strong\u003e: the chemical group linking the two halves of SLU-PP-332, open to hydrolysis in water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePPAR-delta\u003c\/strong\u003e: the nuclear receptor targeted by cardarine, involved in fatty acid handling in muscle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS9 fraction\u003c\/strong\u003e: a liver preparation containing the enzymes that metabolise foreign compounds, used to predict metabolites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLC-HRMS\u003c\/strong\u003e: liquid chromatography with high-resolution mass spectrometry, which measures ion masses precisely enough to propose formulas.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout BioLab Metabolic Boost 100 mcg\u003c\/h2\u003e\n\u003cp\u003eMetabolic Boost is the name BioLab gives its SLU-PP-332 capsules, and the name identifies the product rather than describing what the compound does. The 100 mcg tub is the lowest of three strengths in the line, alongside \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-200-mcg-60-caps\"\u003e200 mcg\u003c\/a\u003e and \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-500-mcg-60-caps\"\u003e500 mcg\u003c\/a\u003e versions; all hold 60 capsules, so the labelled totals run 6, 12 and 30 mg. The front of this tub shows the strength twice, in a 100 MCG\/CAPS arrow tag next to 60 CAPS and in a yellow starburst beside the tiger emblem, with SLU-PP-332 printed under the orange METABOLIC BOOST bar. BioLab's shop also lists a separate 30-capsule SLU-PP-332 product under another name, which we do not stock.\u003c\/p\u003e\n\u003cp\u003eBioLab files its research compounds apart from its supplements, calls them preparations for laboratory use that are not for consumption, and describes itself as their distributor; no manufacturer is named. Of the three Metabolic Boost listings, this is the only one carrying a BioLab laboratory report, covered in the certificate section above.\u003c\/p\u003e\n\u003cp\u003eThe other brand of SLU-PP-332 capsules we stock is \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-slu\"\u003eThoroughbred Labs\u003c\/a\u003e, whose 60-capsule tub carries 250 mcg per capsule on its label, 15 mg in all, which places it between BioLab's 200 and 500 mcg tubs on stated content. Thoroughbred Labs publishes its own report for a named batch. Both brands sit side by side in the \u003ca href=\"\/en-ro\/collections\/slu-pp-332\"\u003eSLU-PP-332 collection\u003c\/a\u003e, and their full ranges are on the \u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eBioLab\u003c\/a\u003e and \u003ca href=\"\/en-ro\/collections\/brand-thoroughbred-labs\"\u003eThoroughbred Labs\u003c\/a\u003e pages.\u003c\/p\u003e\n\u003cp\u003eChemically, SLU-PP-332 is a non-peptide compound that switches on all three ERR nuclear receptors. Published work covers mice and cultured cells only, it holds no UK licence of any kind, and WADA treats it as prohibited at all times. To check a tub, read its lot number, set it against the report above, and \u003ca href=\"\/en-ro\/pages\/contact\"\u003econtact us\u003c\/a\u003e with that number to ask what BioLab has supplied for it.\u003c\/p\u003e\n\u003ch2\u003eRelated\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/collections\/slu-pp-332\"\u003eAll brands of SLU-PP-332 we stock, compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eAll BioLab products\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/slu-pp-332-and-5-amino-1mq-research-guide\"\u003eSLU-PP-332 and 5-Amino-1MQ: what the mouse data show\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/collections\/5-amino-1mq\"\u003e5-Amino-1MQ collection\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003eBatch testing and certificates of analysis\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/pages\/shipping\"\u003eDelivery\u003c\/a\u003e and \u003ca href=\"\/en-ro\/pages\/guarantee\"\u003ereturns\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eResearch compounds sold by Free Muscle are supplied for laboratory research use only and are not for human consumption. They are not authorised as medicines by the MHRA, EMA or FDA, are not food supplements, and are sold only to adults aged 18 or over. Nothing on this page is medical or dosing advice. Summaries of published research describe study findings and are not claims about any product.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eReferences\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eBillon C, et al. Synthetic ERRalpha\/beta\/gamma Agonist Induces an ERRalpha-Dependent Acute Aerobic Exercise Response and Enhances Exercise Capacity. ACS Chem Biol. 2023;18(4):756-771. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/36988910\/\" rel=\"noopener\"\u003ePMID: 36988910\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eBillon C, et al. A Synthetic ERR Agonist Alleviates Metabolic Syndrome. J Pharmacol Exp Ther. 2024;388(2):232-240. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/37739806\/\" rel=\"noopener\"\u003ePMID: 37739806\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eBillon C, et al. An orally active estrogen receptor-related receptor agonist, SLU-PP-915, enhances aerobic exercise capacity. J Pharmacol Exp Ther. 2026;393(1):103787. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/41421047\/\" rel=\"noopener\"\u003ePMID: 41421047\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAvliyakulov NK, et al. Analysis and Identification of In Vitro Metabolites of Exercise Mimetic SLU-PP-332 ERRalpha\/beta\/gamma Agonist for Doping-Control Purposes. Drug Test Anal. 2026;18(3):439-450. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/41688415\/\" rel=\"noopener\"\u003ePMID: 41688415\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"BioLab","offers":[{"title":"Default Title","offer_id":48468978598114,"sku":null,"price":77.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/3499\/5426\/files\/metabolic-boost-slu-pp-332-100-mcg-60-caps_521b6688-6369-4210-ab75-0f5dd5218e04.jpg?v=1789931389"},{"product_id":"biolab-metabolic-boost-slu-pp-332-200-mcg-60-caps","title":"BioLab Metabolic Boost (SLU-PP-332) 200 mcg, 60 caps","description":"\u003cp\u003e\u003cstrong\u003eBioLab Metabolic Boost (SLU-PP-332) 200 mcg, 60 caps\u003c\/strong\u003e is a BioLab listing of SLU-PP-332, labelled at 200 mcg (0.2 mg) per capsule, 60 capsules per pack. It is supplied through the \u003ca href=\"\/en-ro\/pages\/muscle-market\"\u003eMuscle Market\u003c\/a\u003e range for laboratory research only, is not for human consumption, and is sold to adults aged 18 and over. Below: what the published research on SLU-PP-332 reports, what the label documents, how batch certificates are handled for BioLab products, and the questions UK buyers most often ask about this compound.\u003c\/p\u003e\n\u003ch2\u003eAbout SLU-PP-332\u003c\/h2\u003e\n\u003cp\u003eSLU-PP-332, also written SLU PP 332, is a synthetic pan-agonist of the oestrogen-related receptors ERR alpha, beta and gamma. These are orphan nuclear receptors, unrelated to the oestrogen receptor despite the name, that regulate mitochondrial biogenesis and oxidative metabolism in muscle and heart. It was characterised as an ERR agonist by Burris, Walker and colleagues at Saint Louis University in work first reported in 2023, and it is behind the exercise-in-a-pill headlines of the last few years.\u003c\/p\u003e\n\u003cp\u003eIn the 2023 ACS Chemical Biology paper, the compound raised mitochondrial function in a muscle cell line, and mice given it showed more type IIa oxidative muscle fibres, an ERR alpha-specific gene programme resembling the acute response to aerobic exercise, and greater treadmill endurance; the authors reported that ERR alpha activation was critical to the endurance effect (Billon et al., 2023). Three of the authors declared shareholdings in a company developing ERR-based therapeutics. A 2024 follow-up in diet-induced obese and ob\/ob mice reported higher energy expenditure and fatty acid oxidation, less fat mass accumulation and improved insulin sensitivity (Billon et al., 2024). There is no human data of any kind, no human pharmacokinetic study, and no safety study in people. It is one of the newest compounds in this market and one of the least characterised. Nothing above is a claim about this product.\u003c\/p\u003e\n\u003cp\u003eChemically it is a small molecule, not a peptide. PubChem (CID 5338394) lists it under CAS number 303760-60-3 with the formula C18H14N2O2 and a molecular weight of 290.3. Its systematic name, 4-hydroxy-N-[(E)-naphthalen-2-ylmethylideneamino]benzamide, describes a naphthalene ring joined to a 4-hydroxybenzoyl group through an acylhydrazone link. Those identifiers are what a certificate of analysis should match.\u003c\/p\u003e\n\u003ch2\u003eThis listing\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eBioLab\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompound: SLU-PP-332\u003c\/li\u003e\n\u003cli\u003eForm: Capsules\u003c\/li\u003e\n\u003cli\u003ePack size: 60 capsules\u003c\/li\u003e\n\u003cli\u003eStrength: 200 mcg (0.2 mg) per capsule, as printed on the BioLab label\u003c\/li\u003e\n\u003cli\u003eTotal in pack: 12 mg (200 mcg x 60 capsules)\u003c\/li\u003e\n\u003cli\u003eBatch certificate of analysis: shown where BioLab supplies one for the batch we hold\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBioLab also lists the same compound at \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-100-mcg-60-caps\"\u003e100 mcg\u003c\/a\u003e and \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-500-mcg-60-caps\"\u003e500 mcg\u003c\/a\u003e per capsule, giving 6 mg and 30 mg per 60-capsule pack. The 200 mcg pack sits between them. For researchers comparing listings on content, the useful figure is total milligrams per pack against cost, explained in our \u003ca href=\"\/en-ro\/blogs\/news\/price-per-mg-compare-sarms-peptides\"\u003eprice per milligram guide\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eSLU-PP-332 in the UK: buying, legal status and what to check\u003c\/h2\u003e\n\u003cp\u003eSearches such as \"SLU PP 332 UK buy\", \"SLU PP 332 UK source\" and \"SLU-PP-332 UK\" usually hide two questions: may it be sold here at all, and how can a buyer tell a credible listing from a guess. On the first, the position is short. SLU-PP-332 is not a licensed medicine in the UK and has not been assessed by the MHRA. It is not an authorised food supplement, and it is not a controlled drug. That leaves one lawful basis for a UK shop, which is sale to adults for laboratory research, with no suggestion that anyone should swallow it. It is not for human consumption. In sport, SLU-PP-332 is not named on the WADA Prohibited List but, as a substance with no current approval for human therapeutic use, it falls under section S0 (non-approved substances) and is prohibited at all times. Anyone subject to anti-doping rules should consult the current list.\u003c\/p\u003e\n\u003cp\u003eOn the second question, the compound's youth is the problem. It entered the pharmacology literature in 2023, reference standards are scarce, and no pharmacopoeia monograph exists, so a label on its own proves little. A listing worth trusting gives the reader enough to check it independently. The table sets out what that means and how this page measures up.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eCheck\u003c\/th\u003e\n\u003cth\u003eWhat it tells a researcher\u003c\/th\u003e\n\u003cth\u003eThis BioLab listing\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eStated strength per capsule\u003c\/td\u003e\n\u003ctd\u003eAllows total content and cost per milligram to be worked out\u003c\/td\u003e\n\u003ctd\u003e200 mcg per capsule, 12 mg per pack, as printed by BioLab\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemical identifiers\u003c\/td\u003e\n\u003ctd\u003eLets a certificate be matched to the right molecule\u003c\/td\u003e\n\u003ctd\u003eCAS 303760-60-3, C18H14N2O2, MW 290.3 (PubChem)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertificate for the batch held\u003c\/td\u003e\n\u003ctd\u003eLinks an analysis to the stock actually shipped\u003c\/td\u003e\n\u003ctd\u003eShown only where BioLab supplies one for that batch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNamed UK seller\u003c\/td\u003e\n\u003ctd\u003eGives a contact, an age check and a returns route\u003c\/td\u003e\n\u003ctd\u003eFreeMuscle, registered in Andorra, dispatching from Scunthorpe; 18+ only; 30-day returns on unopened items\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDelivery terms\u003c\/td\u003e\n\u003ctd\u003eShows the parcel can be traced and is discreet\u003c\/td\u003e\n\u003ctd\u003eFree tracked UK delivery, plain packaging; EU delivery 3-7 working days\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo consumption guidance\u003c\/td\u003e\n\u003ctd\u003eA research listing that gives instructions for use contradicts itself\u003c\/td\u003e\n\u003ctd\u003eNone given\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eOrders placed before 2pm Monday to Friday are processed the same working day. Full terms are on the \u003ca href=\"\/en-ro\/pages\/shipping\"\u003eshipping\u003c\/a\u003e and \u003ca href=\"\/en-ro\/pages\/guarantee\"\u003eguarantee\u003c\/a\u003e pages. The \u003ca href=\"\/en-ro\/blogs\/news\/how-to-choose-a-sarms-supplier-uk-checklist\"\u003eUK supplier checklist\u003c\/a\u003e applies the same tests to any shop, and the \u003ca href=\"\/en-ro\/blogs\/news\/what-are-sarms-the-2026-research-guide\"\u003eresearch guide\u003c\/a\u003e covers the wider legal picture for compounds sold on this basis.\u003c\/p\u003e\n\u003ch2\u003eReading the certificate of analysis for this product\u003c\/h2\u003e\n\u003cp\u003eBioLab is a third-party brand in the Muscle Market range, so the testing position differs from our own label. Every Free Muscle-brand batch is assayed by Janoshik Analytical, an independent laboratory, with the certificate sent on request by email. For BioLab products we show a certificate of analysis only where BioLab supplies one for the specific batch we hold. A generic PDF with no batch number is not a batch certificate, and we do not present one as such. You can contact us with the product name to ask what is held for the current batch. Where a BioLab certificate exists, these are the fields to read.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdentity\u003c\/strong\u003e: the method used to confirm the molecule. HPLC alone matches a retention time against a reference sample; LC-MS adds a mass. With a molecular weight of 290.3, SLU-PP-332 would be expected to appear as a protonated ion close to m\/z 291.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurity\u003c\/strong\u003e: the share of the detected material that is SLU-PP-332, usually from HPLC peak areas. It says nothing about how much is in each capsule.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContent\u003c\/strong\u003e: the measured amount per capsule. At a label figure of 200 mcg, this is a very small quantity to find inside a capsule fill, so a content result is the field that tests the label most directly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBatch number\u003c\/strong\u003e: must be identical to the number on the pack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest date and laboratory\u003c\/strong\u003e: tie the result to a time and to an accountable tester.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf a field is missing, read the gap literally. A certificate with purity but no content confirms the molecule and leaves the 200 mcg figure unverified. A certificate with no batch number describes some material, not necessarily this stock. If BioLab has supplied nothing for the current batch, this listing makes no analytical claim beyond the BioLab label. Our \u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003elab tests page\u003c\/a\u003e and the guide on \u003ca href=\"\/en-ro\/blogs\/news\/how-to-read-a-certificate-of-analysis\"\u003ehow to read a certificate of analysis\u003c\/a\u003e go further, and you can \u003ca href=\"\/en-ro\/pages\/contact\"\u003econtact us\u003c\/a\u003e about any mismatch.\u003c\/p\u003e\n\u003ch2\u003eCapsules compared with other forms\u003c\/h2\u003e\n\u003cp\u003eQueries for \"SLU-PP-332 capsules\" and \"SLU-PP-332 injectable\" reflect the fact that the compound is offered in several formats. The formats differ in how the amount per unit is fixed and in how closely they resemble the published research, not in the molecule itself.\u003c\/p\u003e\n\u003cp\u003eThe published mouse studies were not studies of capsules, and oral exposure in people has never been measured, so oral absorption of this molecule in humans is an open question. Because SLU-PP-332 is a small molecule rather than a peptide, the argument that stomach enzymes break peptides down does not apply to it in the same way, though acid may be relevant to its acylhydrazone link, as the storage section explains.\u003c\/p\u003e\n\u003cp\u003eUniformity is the other practical difference. A capsule holds a weighed powder fill, and at 200 mcg the active ingredient must be spread through a much larger mass of filler; uneven blending is the main risk, and only a content assay on the batch can show whether it happened. A liquid is measured by volume and depends on the compound staying dissolved and intact in its solvent. Loose powder puts all the weighing on the researcher. None of these differences is a claim about effect.\u003c\/p\u003e\n\u003ch2\u003eSLU-PP-332 compared with Cardarine (GW501516)\u003c\/h2\u003e\n\u003cp\u003eThe comparison most searched alongside SLU-PP-332 is with other so-called exercise mimetics, and the one stocked here is \u003ca href=\"\/en-ro\/collections\/cardarine\"\u003eCardarine (GW501516)\u003c\/a\u003e. Both are small molecules that act on nuclear receptors controlling oxidative metabolism in muscle, and both became known through mouse treadmill experiments. There the resemblance largely ends.\u003c\/p\u003e\n\u003cp\u003eCardarine is an agonist of PPAR delta, a different receptor from the ERR family. In a 2008 Cell study, a PPAR delta agonist combined with training increased oxidative muscle fibres and running endurance in mice, while an AMPK activator, AICAR, raised endurance in sedentary mice after four weeks (Narkar et al., 2008). That paper made \"exercise mimetic\" a research term, and SLU-PP-332 was later studied as a route to a similar gene programme through ERR instead. Development history also separates them. GW501516 was a pharmaceutical drug candidate that reached early human studies before development stopped after cancers were found in long-term rodent studies, a history covered in our article on \u003ca href=\"\/en-ro\/blogs\/news\/cardarine-gw-501516-what-happened-in-development\"\u003ewhat happened in Cardarine's development\u003c\/a\u003e. SLU-PP-332 has never entered a human study.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePoint of comparison\u003c\/th\u003e\n\u003cth\u003eSLU-PP-332\u003c\/th\u003e\n\u003cth\u003eCardarine (GW501516)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTarget\u003c\/td\u003e\n\u003ctd\u003eERR alpha, beta and gamma (agonist)\u003c\/td\u003e\n\u003ctd\u003ePPAR delta (agonist)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResearch origin\u003c\/td\u003e\n\u003ctd\u003eReported as an ERR agonist in 2023, academic laboratory\u003c\/td\u003e\n\u003ctd\u003ePharmaceutical drug candidate from around 2001\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHuman data\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eEarly-phase studies only, development ended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain known concern\u003c\/td\u003e\n\u003ctd\u003eSafety simply uncharacterised\u003c\/td\u003e\n\u003ctd\u003eTumours in long-term rodent studies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWADA position\u003c\/td\u003e\n\u003ctd\u003eNot named; S0 non-approved substance\u003c\/td\u003e\n\u003ctd\u003eNamed under S4 metabolic modulators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUK status\u003c\/td\u003e\n\u003ctd\u003eUnlicensed; research use only\u003c\/td\u003e\n\u003ctd\u003eUnlicensed; research use only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eNeither compound is licensed for any use in people. The comparison is pharmacological and regulatory only, and nothing here suggests using either one, alone or with anything else.\u003c\/p\u003e\n\u003ch2\u003eDetection, sport and testing\u003c\/h2\u003e\n\u003cp\u003eFor athletes, the relevant point is that SLU-PP-332 is prohibited at all times under section S0 of the WADA list even though it is not named, because it has no approval for human therapeutic use. Anti-doping laboratories have already begun preparing for it. A doping-control group at the German Sport University Cologne characterised SLU-PP-332 and SLU-PP-915 by liquid chromatography with high-resolution tandem mass spectrometry and incubated both with human liver preparations; for SLU-PP-332 they identified nine metabolites, six Phase I products and three Phase II conjugates, and described the work as a basis for uncovering misuse (Möller et al., 2026).\u003c\/p\u003e\n\u003cp\u003eThat study was carried out in vitro. No excretion study in people has been published, so there is no established detection window for SLU-PP-332 in urine or blood, and any figure quoted for how long it remains detectable is unsupported. The accurate summary is that it is detectable in principle, that laboratories have the target metabolites to look for, and that the window has not been established. Anyone bound by an anti-doping code should treat it as prohibited and check the current list, which is updated every year.\u003c\/p\u003e\n\u003ch2\u003eStorage, stability and handling\u003c\/h2\u003e\n\u003cp\u003eNeither BioLab nor anyone else has published stability data for SLU-PP-332 capsules, so storage advice rests on the structure of the molecule and on laboratory practice. The acylhydrazone link at the centre of SLU-PP-332 is the part chemists watch: hydrazone bonds can be cleaved by water under acidic conditions, and the carbon-nitrogen double bond can switch between E and Z forms when exposed to light. Heat speeds both processes. Keeping the capsules dry, dark and cool therefore protects the compound itself as well as the capsule shell.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKeep the pack sealed in its original container, with any desiccant left in place.\u003c\/li\u003e\n\u003cli\u003eStore at room temperature or below, away from heat sources and direct sunlight.\u003c\/li\u003e\n\u003cli\u003eAvoid bathrooms, kitchens and other humid places, and close the lid promptly after opening.\u003c\/li\u003e\n\u003cli\u003eDo not transfer capsules to unlabelled containers; the batch number on the pack is what links it to any certificate.\u003c\/li\u003e\n\u003cli\u003eKeep out of reach of children and away from food.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDiscard capsules that have clumped, softened or changed colour, and follow normal laboratory rules on labelling, gloves and disposal.\u003c\/p\u003e\n\u003ch2\u003eGlossary\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eERR (oestrogen-related receptor)\u003c\/strong\u003e: one of three orphan nuclear receptors, alpha, beta and gamma, that control genes for mitochondrial energy production. They do not bind oestrogen.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePan-agonist\u003c\/strong\u003e: a compound that activates every member of a receptor family rather than one.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrphan nuclear receptor\u003c\/strong\u003e: a receptor for which no hormone produced by the body has been confirmed as its ligand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExercise mimetic\u003c\/strong\u003e: a research term for a compound that triggers some of the molecular changes seen after exercise, used of animal and cell findings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMitochondrial biogenesis\u003c\/strong\u003e: the formation of new mitochondria inside cells.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePPAR delta\u003c\/strong\u003e: a separate nuclear receptor, the target of Cardarine (GW501516).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcylhydrazone\u003c\/strong\u003e: the chemical link joining the two ring systems of SLU-PP-332, sensitive to acid and moisture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHPLC\u003c\/strong\u003e: high-performance liquid chromatography, the usual method for purity figures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLC-MS\u003c\/strong\u003e: liquid chromatography with mass spectrometry, which confirms identity by molecular mass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetabolite\u003c\/strong\u003e: a product the body forms from a compound; anti-doping tests often target metabolites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection S0\u003c\/strong\u003e: the WADA category for substances with no current approval for human therapeutic use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertificate of analysis (COA)\u003c\/strong\u003e: a laboratory report of identity, purity and content for a named batch.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout BioLab Metabolic Boost 200 mcg\u003c\/h2\u003e\n\u003cp\u003eBioLab sells its SLU-PP-332 capsules as Metabolic Boost, a trade name for the product rather than a statement about any effect. This tub is the middle strength of three: 200 mcg per capsule and 60 capsules, 12 mg in total, between the \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-100-mcg-60-caps\"\u003e100 mcg tub\u003c\/a\u003e at 6 mg and the \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-500-mcg-60-caps\"\u003e500 mcg tub\u003c\/a\u003e at 30 mg. The three share one design, a purple-blue tub with orange trim, the tiger emblem and SLU-PP-332 beneath the product name, so the 200 MCG\/CAPS tag and the 200 mcg starburst are what identify this strength.\u003c\/p\u003e\n\u003cp\u003eWho makes it is not stated. By BioLab's own account it distributes its research-only preparations rather than producing them, and it marks them as not for consumption. A fourth SLU-PP-332 product that BioLab sells in 30-capsule tubs under another name is not stocked here.\u003c\/p\u003e\n\u003ch3\u003eLab reports for this strength\u003c\/h3\u003e\n\u003cp\u003eNo BioLab report is attached to this listing at present. The one Metabolic Boost report we hold was run on a 100 mcg sample in October 2024 and does not describe a 200 mcg fill. BioLab states that each product's current report is posted in its gallery and Tests tab on the brand's shop and can be requested. A report that tests this label would give the measured content per capsule against 200 mcg, the date and the lot number; \u003ca href=\"\/en-ro\/pages\/contact\"\u003econtact us\u003c\/a\u003e with the lot on your tub to ask what is held for it.\u003c\/p\u003e\n\u003cp\u003eAmong other brands, \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-slu\"\u003eThoroughbred Labs SLU-PP-332\u003c\/a\u003e is labelled at 250 mcg per capsule in a 60-capsule tub (15 mg), a little above this one; the two sit together in the \u003ca href=\"\/en-ro\/collections\/slu-pp-332\"\u003eSLU-PP-332 collection\u003c\/a\u003e, and each brand's range is on its own page, \u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eBioLab\u003c\/a\u003e or \u003ca href=\"\/en-ro\/collections\/brand-thoroughbred-labs\"\u003eThoroughbred Labs\u003c\/a\u003e. The compound is an experimental ERR agonist developed at Saint Louis University, studied only in mice and cells, unlicensed in the UK and, for anyone subject to anti-doping rules, prohibited by WADA in and out of competition.\u003c\/p\u003e\n\u003ch2\u003eRelated\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/collections\/slu-pp-332\"\u003eAll brands of SLU-PP-332 we stock, compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eAll BioLab products\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/slu-pp-332-and-5-amino-1mq-research-guide\"\u003eSLU-PP-332 and 5-Amino-1MQ research guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/collections\/cardarine\"\u003eCardarine (GW501516)\u003c\/a\u003e and \u003ca href=\"\/en-ro\/collections\/5-amino-1mq\"\u003e5-Amino-1MQ\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003eBatch testing and certificates of analysis\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/pages\/shipping\"\u003eDelivery\u003c\/a\u003e and \u003ca href=\"\/en-ro\/pages\/guarantee\"\u003ereturns\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eResearch compounds sold by Free Muscle are supplied for laboratory research use only and are not for human consumption. They are not authorised as medicines by the MHRA, EMA or FDA, are not food supplements, and are sold only to adults aged 18 or over. Nothing on this page is medical or dosing advice. Summaries of published research describe study findings and are not claims about any product.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eReferences\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBillon C, et al. Synthetic ERRalpha\/beta\/gamma Agonist Induces an ERRalpha-Dependent Acute Aerobic Exercise Response and Enhances Exercise Capacity. ACS Chem Biol. 2023;18(4):756-771. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/36988910\/\" rel=\"noopener\"\u003ePMID: 36988910\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eBillon C, et al. A Synthetic ERR Agonist Alleviates Metabolic Syndrome. J Pharmacol Exp Ther. 2024;388(2):232-240. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/37739806\/\" rel=\"noopener\"\u003ePMID: 37739806\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eMöller T, et al. In Vitro Metabolism and Analytical Characterization of SLU-PP-332 and SLU-PP-915: Novel Pan-ERR Agonists With Doping Potential. Rapid Commun Mass Spectrom. 2026;40(8):e70039. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/41588687\/\" rel=\"noopener\"\u003ePMID: 41588687\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eNarkar VA, et al. AMPK and PPARdelta agonists are exercise mimetics. Cell. 2008;134(3):405-415. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/18674809\/\" rel=\"noopener\"\u003ePMID: 18674809\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BioLab","offers":[{"title":"Default Title","offer_id":48468978761954,"sku":null,"price":145.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/3499\/5426\/files\/metabolic-boost-slu-pp-332-200-mcg-60-caps_1a9b364b-93a7-4d08-b164-0b9fff7ee2cb.jpg?v=1789931391"},{"product_id":"biolab-metabolic-boost-slu-pp-332-500-mcg-60-caps","title":"BioLab Metabolic Boost (SLU-PP-332) 500 mcg, 60 caps","description":"\u003cp\u003e\u003cstrong\u003eBioLab Metabolic Boost (SLU-PP-332) 500 mcg, 60 caps\u003c\/strong\u003e is a BioLab listing of SLU-PP-332, labelled at 500 mcg (0.5 mg) per capsule, 60 capsules per pack. It is supplied through the \u003ca href=\"\/en-ro\/pages\/muscle-market\"\u003eMuscle Market\u003c\/a\u003e range for laboratory research only, is not for human consumption, and is sold to adults aged 18 and over. Below: what the published research on SLU-PP-332 reports, what the label documents, how batch certificates are handled for BioLab products, and how the compound differs from 5-Amino-1MQ.\u003c\/p\u003e\n\u003ch2\u003eAbout SLU-PP-332\u003c\/h2\u003e\n\u003cp\u003eSLU-PP-332, also written SLU PP 332, is a synthetic pan-agonist of the oestrogen-related receptors ERR alpha, beta and gamma. These are orphan nuclear receptors, unrelated to the oestrogen receptor despite the name, that regulate mitochondrial biogenesis and oxidative metabolism in muscle and heart. The compound was developed by Burris, Walker and colleagues at Saint Louis University and first published in 2023.\u003c\/p\u003e\n\u003cp\u003eIn the 2023 ACS Chemical Biology paper, mice given SLU-PP-332 showed a pattern of gene expression in muscle resembling the acute response to aerobic exercise and showed more oxidative type IIa muscle fibres and greater exercise endurance; the authors reported that ERR alpha activation was critical for the endurance effect (Billon et al., 2023). A 2024 follow-up in diet-induced obese mice and in ob\/ob mice reported increased energy expenditure and fatty acid oxidation, less fat mass accumulation and improved insulin sensitivity (Billon et al., 2024). The authors of both papers include stockholders in a company focused on ERR-based therapeutics. There is no human data of any kind, no human pharmacokinetic study, and no safety study in people. Nothing above is a claim about this product.\u003c\/p\u003e\n\u003cp\u003eIn structural terms SLU-PP-332 is a compact aromatic molecule rather than a peptide or a steroid. PubChem records it as CID 5338394, CAS 303760-60-3, with the formula C18H14N2O2 and a molecular weight of 290.3 g\/mol; its IUPAC name is 4-hydroxy-N-[(E)-naphthalen-2-ylmethylideneamino]benzamide. These are the identifiers any analytical report on this product should agree with.\u003c\/p\u003e\n\u003ch2\u003eThis listing\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eBioLab\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompound: SLU-PP-332\u003c\/li\u003e\n\u003cli\u003eForm: Capsules\u003c\/li\u003e\n\u003cli\u003ePack size: 60 capsules\u003c\/li\u003e\n\u003cli\u003eStrength: 500 mcg (0.5 mg) per capsule, as printed on the BioLab label\u003c\/li\u003e\n\u003cli\u003eTotal in pack: 30 mg (500 mcg x 60 capsules)\u003c\/li\u003e\n\u003cli\u003eBatch certificate of analysis: shown where BioLab supplies one for the batch we hold\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis is the highest per-capsule figure BioLab lists for SLU-PP-332. The same 60-capsule format is also sold at \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-100-mcg-60-caps\"\u003e100 mcg\u003c\/a\u003e (6 mg per pack) and \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-200-mcg-60-caps\"\u003e200 mcg\u003c\/a\u003e (12 mg per pack), so this pack holds five times the labelled content of the smallest one. \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-slu\"\u003eThoroughbred Labs SLU-PP-332\u003c\/a\u003e is a separate 60-capsule listing whose label states 250 mcg per capsule, 15 mg per pack, half the per-capsule figure of this tub. When comparing listings, divide cost by total milligrams, as set out in our \u003ca href=\"\/en-ro\/blogs\/news\/price-per-mg-compare-sarms-peptides\"\u003eprice per milligram guide\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eSLU-PP-332 in the UK: buying, legal status and what to check\u003c\/h2\u003e\n\u003cp\u003eSearch terms like \"SLU PP 332 UK buy\", \"SLU PP 332 UK sale\" and \"SLU PP 332 UK source\" suggest many people assume the compound is an ordinary retail product. It is not, and the legal framework explains why.\u003c\/p\u003e\n\u003ch3\u003eWhere the law stands\u003c\/h3\u003e\n\u003cp\u003eNo regulator anywhere has licensed SLU-PP-332. In the UK it is not a licensed medicine, it has never been assessed by the MHRA, and it is not an authorised food supplement or novel food, so it cannot lawfully be marketed as something to swallow. It is not a controlled drug either. The route left open is supply for laboratory research to adults, and that is the only basis on which this listing exists: 18+ only, and not for human consumption. A marketplace page describing it as a supplement, or a \"compounding\" service offering it as a treatment, is presenting it as something no authority has approved. In sport, SLU-PP-332 is prohibited at all times: as a substance with no current approval for human therapeutic use it is caught by section S0 (non-approved substances) of the WADA Prohibited List, whether or not the list names it.\u003c\/p\u003e\n\u003ch3\u003eQuestions worth putting to any UK seller\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhose product is it?\u003c\/strong\u003e A named brand can be held to its label. Here the brand is BioLab, which describes itself as the distributor of its research preparations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the stated content, in which unit?\u003c\/strong\u003e Micrograms and milligrams differ by a factor of a thousand. This pack states 500 mcg per capsule and 60 capsules, 30 mg in total.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs there a certificate for the batch actually in stock?\u003c\/strong\u003e For BioLab we show one only where BioLab has supplied it for the batch we hold, and say so where it has not.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs the seller identifiable?\u003c\/strong\u003e FreeMuscle is registered in Andorra, has its UK operations and dispatch in Scunthorpe, sells only to adults, and accepts returns of unopened items within 30 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow does it travel?\u003c\/strong\u003e Every UK order ships free by tracked delivery in plain packaging; orders placed before 2pm Monday to Friday are processed the same working day, and EU delivery takes 3-7 working days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes the listing tell you how to use it?\u003c\/strong\u003e A research listing should not, and this one does not.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eReviews that describe personal outcomes cannot confirm what a capsule contained, so we do not publish them. Terms are on our \u003ca href=\"\/en-ro\/pages\/shipping\"\u003eshipping\u003c\/a\u003e and \u003ca href=\"\/en-ro\/pages\/guarantee\"\u003eguarantee\u003c\/a\u003e pages, and the \u003ca href=\"\/en-ro\/blogs\/news\/how-to-choose-a-sarms-supplier-uk-checklist\"\u003eUK supplier checklist\u003c\/a\u003e applies the same tests to any shop.\u003c\/p\u003e\n\u003ch2\u003eCapsules compared with other forms\u003c\/h2\u003e\n\u003cp\u003eSLU-PP-332 is offered as capsules, as liquids and as vials marketed for injection, which is why \"SLU-PP-332 capsules\" and \"SLU-PP-332 injectable\" are both frequent searches. The literature answers part of that question directly. None of the published animal studies tested a capsule. In a 2026 paper introducing a successor molecule, SLU-PP-915, the same research group stated that SLU-PP-332 improves aerobic performance in mice but lacks oral bioavailability, and presented oral activity as the reason for developing the new compound (Billon et al., 2026). The authors disclose that one of them is an inventor on the university's rights and holds shares in companies developing ERR agonists. No study has measured SLU-PP-332 exposure after oral intake in any species, so this page makes no claim about what a capsule does.\u003c\/p\u003e\n\u003cp\u003eBecause SLU-PP-332 is a small molecule, the usual explanation for poor oral uptake of peptides, digestion by stomach and gut enzymes, does not describe its problem; the abstract does not give a cause. Our article \u003ca href=\"\/en-ro\/blogs\/news\/do-oral-peptides-work\"\u003edo oral peptides work\u003c\/a\u003e covers the separate peptide case.\u003c\/p\u003e\n\u003cp\u003eThe practical differences between forms are about measurement and stability. A capsule fixes the amount at the filling stage: at 500 mcg the active is still well under a milligram per capsule, so its accuracy depends on how evenly the powder blend was mixed before filling. A liquid moves that uncertainty to the solvent and the measuring device, and keeps the acylhydrazone link in contact with water for its whole shelf life. Only a batch content assay can show whether either format matches its label.\u003c\/p\u003e\n\u003ch2\u003eSLU-PP-332 compared with 5-Amino-1MQ\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"\/en-ro\/collections\/5-amino-1mq\"\u003e5-Amino-1MQ\u003c\/a\u003e is often discussed alongside SLU-PP-332, and our research guide covers the two together, because both are small molecules studied in obese mice and both are sold under metabolic headings. Their mechanisms are unrelated. SLU-PP-332 switches on transcription factors, the ERR receptors, that drive genes for mitochondrial energy production. 5-Amino-1MQ (5-amino-1-methylquinolinium) works on an enzyme instead: it inhibits nicotinamide N-methyltransferase (NNMT), which methylates nicotinamide and in doing so draws on the cell's pools of NAD+ and the methyl donor SAM.\u003c\/p\u003e\n\u003cp\u003eThe key 5-Amino-1MQ paper came from the University of Texas Medical Branch. Methylquinolinium inhibitors of NNMT, the chemical series to which 5-Amino-1MQ belongs, were selective against related methyltransferases, lowered the NNMT product 1-methylnicotinamide, raised intracellular NAD+ and SAM, and suppressed fat formation in cultured fat cells. In diet-induced obese mice, a potent inhibitor from the series given systemically reduced body weight, white fat mass and plasma cholesterol without a change in food intake, and the authors saw no observable adverse effects (Neelakantan et al., 2018). That was a short study in mice, not a toxicology programme, and no human trial has been published for either compound.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSLU-PP-332\u003c\/th\u003e\n\u003cth\u003e5-Amino-1MQ\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTarget type\u003c\/td\u003e\n\u003ctd\u003eNuclear receptors (ERR alpha, beta, gamma)\u003c\/td\u003e\n\u003ctd\u003eEnzyme (NNMT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAction\u003c\/td\u003e\n\u003ctd\u003eAgonist\u003c\/td\u003e\n\u003ctd\u003eInhibitor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePubChem CID and formula\u003c\/td\u003e\n\u003ctd\u003e5338394, C18H14N2O2 (neutral)\u003c\/td\u003e\n\u003ctd\u003e950107, C10H11N2+ (a cation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular weight\u003c\/td\u003e\n\u003ctd\u003e290.3 g\/mol\u003c\/td\u003e\n\u003ctd\u003e159.2 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEvidence base\u003c\/td\u003e\n\u003ctd\u003eMouse and cell studies from 2023 onwards\u003c\/td\u003e\n\u003ctd\u003eCell and mouse studies from 2018 onwards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLicensed anywhere\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWADA position\u003c\/td\u003e\n\u003ctd\u003eProhibited at all times (at least under S0, non-approved substances)\u003c\/td\u003e\n\u003ctd\u003eProhibited at all times (at least under S0, non-approved substances)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eBeing charged, 5-Amino-1MQ behaves differently in analysis and in solution from the neutral SLU-PP-332, which is one reason their certificates are not interchangeable. The comparison is chemical and regulatory only. It says nothing about using either compound, singly or alongside any other.\u003c\/p\u003e\n\u003ch2\u003eReading the certificate of analysis for this product\u003c\/h2\u003e\n\u003cp\u003eBioLab is a third-party brand in the Muscle Market range, so the testing position differs from our own label. Every Free Muscle-brand batch is assayed by Janoshik Analytical, an independent laboratory, with the certificate sent on request by email. For BioLab products we show a certificate of analysis only where BioLab supplies one for the specific batch we hold. A generic PDF with no batch number is not a batch certificate, and we do not present one as such. Email us with the product name and we will send what we hold, or say plainly that there is none.\u003c\/p\u003e\n\u003cp\u003eNo BioLab certificate is attached to this 500 mcg listing yet. When one is supplied for this pack, read it against the following:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdentity method.\u003c\/strong\u003e HPLC compares a retention time with a reference standard, which is only as good as that standard; for a compound this new, reference material is scarce. LC-MS adds a measured mass, and for SLU-PP-332 the protonated molecule should appear near m\/z 291.1.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurity percentage.\u003c\/strong\u003e The proportion of the detected signal attributable to SLU-PP-332. A capsule mostly made of filler can still show high purity, because purity describes the active fraction, not its amount.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContent per capsule.\u003c\/strong\u003e The result that tests the 500 mcg on the label.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBatch number.\u003c\/strong\u003e Compare it with the code on the bottle; any difference, even one digit, means the report covers other stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDate and laboratory.\u003c\/strong\u003e A named laboratory and test date place the result in time; a certificate years older than the pack describes earlier stock.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhat a gap means is fairly literal. With no content figure, the 500 mcg claim rests on BioLab's label alone. With no batch number, the report cannot be linked to this stock. With no certificate at all, this listing makes no analytical claim beyond what BioLab prints. See our \u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003elab tests page\u003c\/a\u003e, the guide on \u003ca href=\"\/en-ro\/blogs\/news\/how-to-read-a-certificate-of-analysis\"\u003ehow to read a certificate of analysis\u003c\/a\u003e, or \u003ca href=\"\/en-ro\/pages\/contact\"\u003econtact us\u003c\/a\u003e about a specific batch.\u003c\/p\u003e\n\u003ch2\u003eDetection, sport and testing\u003c\/h2\u003e\n\u003cp\u003eUnder the WADA Code, SLU-PP-332 is caught by section S0, which covers any pharmacological substance without current approval for human therapeutic use, so it is prohibited in and out of competition whether or not the list names it. Anti-doping laboratories have already published in vitro work on its metabolism: the UCLA Olympic Analytical Laboratory incubated SLU-PP-332 with pooled human liver S9 fractions and, using high-resolution LC-MS, identified 22 metabolites, including hydroxylated, glucuronidated and sulfated forms, several of them proposed as targets for doping control (Avliyakulov et al., 2026). The authors note that further work is needed to confirm the structures.\u003c\/p\u003e\n\u003cp\u003eWhat has not been published is an excretion study in people, so there is no validated detection window in urine or blood. Any number of days quoted online is unsupported. The accurate position is that the compound is detectable in principle and the window has not been established. Competitors in tested sport, including events run under UK Anti-Doping rules, should treat it as prohibited and check the current list, which changes every January.\u003c\/p\u003e\n\u003ch2\u003eStorage, stability and handling\u003c\/h2\u003e\n\u003cp\u003eBioLab has published no stability study for these capsules, so the sensible approach follows from the chemistry. The weak point of SLU-PP-332 is the acylhydrazone bridge between its two ring systems. Moisture, particularly with any acidity, can split that bond back into its starting fragments, and light can convert the E arrangement of the carbon-nitrogen double bond into the Z form, a different shape. Warmth accelerates both.\u003c\/p\u003e\n\u003cp\u003eIn practice that means leaving the capsules in the original BioLab container with the lid closed and any desiccant in place, stored at or below room temperature in a dark cupboard rather than on a windowsill or near a radiator, kettle or shower. Keep the original label, since the batch number is the only link between the pack and any certificate. Capsules that have stuck together, softened or discoloured should be set aside and disposed of according to local rules rather than examined further. Keep the pack out of reach of children and apart from food, and handle it with the ordinary laboratory precautions of gloves, clear labelling and a clean work surface.\u003c\/p\u003e\n\u003ch2\u003eGlossary\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOestrogen-related receptor (ERR)\u003c\/strong\u003e: named for sequence similarity to the oestrogen receptor, the ERR alpha, beta and gamma proteins do not respond to oestrogen and govern energy-producing genes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAgonist\u003c\/strong\u003e: a molecule that activates a receptor; SLU-PP-332 activates all three ERRs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNuclear receptor\u003c\/strong\u003e: a protein inside the cell that binds a molecule and then switches sets of genes on or off.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOxidative metabolism\u003c\/strong\u003e: energy production that uses oxygen, carried out in mitochondria.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOral bioavailability\u003c\/strong\u003e: how much of a compound taken in by mouth survives absorption and first passage through the liver to circulate intact, expressed as a percentage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNNMT\u003c\/strong\u003e: nicotinamide N-methyltransferase, the enzyme inhibited by 5-Amino-1MQ.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNAD+\u003c\/strong\u003e: a coenzyme central to cellular energy reactions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcylhydrazone\u003c\/strong\u003e: a C(=O)-NH-N=C bridge; in SLU-PP-332 it joins the naphthalene and hydroxybenzoyl parts and is the likeliest site of breakdown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLabel claim\u003c\/strong\u003e: the amount per capsule printed on the BioLab label, here 500 mcg.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003em\/z\u003c\/strong\u003e: mass-to-charge ratio, the value a mass spectrometer reports for an ion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout BioLab Metabolic Boost 500 mcg\u003c\/h2\u003e\n\u003cp\u003eThis is the top strength in BioLab's Metabolic Boost line, the brand's trade name for its SLU-PP-332 capsules; the name belongs to the product and says nothing about effects. With 500 mcg per capsule and 60 capsules, the tub is labelled at 30 mg in total, five times the 100 mcg tub and two and a half times the 200 mcg tub. On the front, a 500 MCG\/CAPS arrow tag, a 60 CAPS tag and a yellow 500 mcg starburst mark the strength, while the purple-blue tub, orange trim, tiger head and BIOLAB band match the lower strengths.\u003c\/p\u003e\n\u003cp\u003eBioLab keeps its research compounds in a category separate from its supplements, marks them as not for consumption and says it acts only as their distributor, leaving the maker unnamed.\u003c\/p\u003e\n\u003ch3\u003eComparing the three BioLab strengths\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eListing\u003c\/th\u003e\n\u003cth\u003ePer capsule\u003c\/th\u003e\n\u003cth\u003eCapsules\u003c\/th\u003e\n\u003cth\u003eTotal per tub\u003c\/th\u003e\n\u003cth\u003eBioLab report on our listing\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-100-mcg-60-caps\"\u003eMetabolic Boost 100 mcg\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e100 mcg\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e6 mg\u003c\/td\u003e\n\u003ctd\u003eYes, October 2024\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-200-mcg-60-caps\"\u003eMetabolic Boost 200 mcg\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e200 mcg\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e12 mg\u003c\/td\u003e\n\u003ctd\u003eNone at present\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetabolic Boost 500 mcg (this listing)\u003c\/td\u003e\n\u003ctd\u003e500 mcg\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e30 mg\u003c\/td\u003e\n\u003ctd\u003eNone at present\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eDocuments for this strength\u003c\/h3\u003e\n\u003cp\u003eBioLab says it posts the current report for each product in the gallery and Tests tab of its own shop and supplies it on request. None is shown here for the 500 mcg tub, and the 2024 report on the 100 mcg listing does not cover this fill. A report that could confirm this label would state content per capsule against 500 mcg, with a date and a lot number; mention the lot on your tub when asking what documents are held. The other brand we stock, \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-slu\"\u003eThoroughbred Labs\u003c\/a\u003e, prints 250 mcg per capsule on a 60-capsule tub (15 mg in total); the \u003ca href=\"\/en-ro\/collections\/slu-pp-332\"\u003eSLU-PP-332 collection\u003c\/a\u003e sets the brands against each other, with the full ranges on the \u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eBioLab\u003c\/a\u003e and \u003ca href=\"\/en-ro\/collections\/brand-thoroughbred-labs\"\u003eThoroughbred Labs\u003c\/a\u003e pages.\u003c\/p\u003e\n\u003cp\u003eThe compound itself is a preclinical research molecule: a pan-ERR agonist from Saint Louis University with no human data, no UK licence and a WADA prohibition that applies at all times.\u003c\/p\u003e\n\u003ch2\u003eRelated\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/collections\/slu-pp-332\"\u003eAll brands of SLU-PP-332 we stock, compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/collections\/brand-biolab\"\u003eAll BioLab products\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/collections\/5-amino-1mq\"\u003e5-Amino-1MQ\u003c\/a\u003e and \u003ca href=\"\/en-ro\/collections\/cardarine\"\u003eCardarine (GW-501516)\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/slu-pp-332-and-5-amino-1mq-research-guide\"\u003eSLU-PP-332 and 5-Amino-1MQ research guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/what-are-sarms-the-2026-research-guide\"\u003eResearch guide to SARMs and related compounds\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003eBatch testing and certificates of analysis\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/pages\/shipping\"\u003eDelivery\u003c\/a\u003e and \u003ca href=\"\/en-ro\/pages\/guarantee\"\u003ereturns\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eResearch compounds sold by Free Muscle are supplied for laboratory research use only and are not for human consumption. They are not authorised as medicines by the MHRA, EMA or FDA, are not food supplements, and are sold only to adults aged 18 or over. Nothing on this page is medical or dosing advice. Summaries of published research describe study findings and are not claims about any product.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eReferences\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBillon C, et al. Synthetic ERRalpha\/beta\/gamma Agonist Induces an ERRalpha-Dependent Acute Aerobic Exercise Response and Enhances Exercise Capacity. ACS Chem Biol. 2023;18(4):756-771. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/36988910\/\" rel=\"noopener\"\u003ePMID: 36988910\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eBillon C, et al. A Synthetic ERR Agonist Alleviates Metabolic Syndrome. J Pharmacol Exp Ther. 2024;388(2):232-240. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/37739806\/\" rel=\"noopener\"\u003ePMID: 37739806\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eBillon C, et al. An orally active estrogen receptor-related receptor agonist, SLU-PP-915, enhances aerobic exercise capacity. J Pharmacol Exp Ther. 2026;393(1):103787. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/41421047\/\" rel=\"noopener\"\u003ePMID: 41421047\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAvliyakulov NK, et al. Analysis and Identification of In Vitro Metabolites of Exercise Mimetic SLU-PP-332 ERRalpha\/beta\/gamma Agonist for Doping-Control Purposes. Drug Test Anal. 2026;18(3):439-450. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/41688415\/\" rel=\"noopener\"\u003ePMID: 41688415\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eNeelakantan H, et al. Selective and membrane-permeable small molecule inhibitors of nicotinamide N-methyltransferase reverse high fat diet-induced obesity in mice. Biochem Pharmacol. 2018;147:141-152. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/29155147\/\" rel=\"noopener\"\u003ePMID: 29155147\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BioLab","offers":[{"title":"Default Title","offer_id":48468978794722,"sku":null,"price":205.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/3499\/5426\/files\/metabolic-boost-slu-pp-332-500-mcg-60-caps_2025fe19-4aad-435d-bec7-acbebe9e6a63.jpg?v=1789931393"},{"product_id":"thoroughbred-labs-slu","title":"Thoroughbred Labs SLU-PP-332","description":"\u003cp\u003e\u003cstrong\u003eThoroughbred Labs SLU-PP-332\u003c\/strong\u003e is a Thoroughbred Labs listing of SLU-PP-332, supplied as 60 capsules per pack, each capsule stated by Thoroughbred Labs at 250 mcg on the tub's side panel and on its own product page, where the brand lists the product simply as SLU. It is supplied through the \u003ca href=\"\/en-ro\/pages\/muscle-market\"\u003eMuscle Market\u003c\/a\u003e range for laboratory research only, is not for human consumption, and is sold to adults aged 18 and over. This page sets out what the published research on SLU-PP-332 reports, what the label documents and what it leaves out, how batch certificates are handled for Thoroughbred Labs products, and how the compound sits in UK law and in sport.\u003c\/p\u003e\n\u003ch2\u003eAbout SLU-PP-332\u003c\/h2\u003e\n\u003cp\u003eSLU PP 332, to give the common alternative spelling, is a synthetic compound that activates all three oestrogen-related receptors: ERR alpha, ERR beta and ERR gamma. Despite the name, these orphan nuclear receptors have nothing to do with the oestrogen receptor; in muscle and heart they control how many mitochondria cells build and how much fuel they oxidise. It came from the laboratories of Thomas Burris and John Walker, working at Saint Louis University and partner institutions, and its first full characterisation was published in 2023. It is the molecule behind recent exercise-in-a-pill headlines.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eIdentifier\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePubChem CID\u003c\/td\u003e\n\u003ctd\u003e5338394\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCAS number\u003c\/td\u003e\n\u003ctd\u003e303760-60-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular formula\u003c\/td\u003e\n\u003ctd\u003eC18H14N2O2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular weight\u003c\/td\u003e\n\u003ctd\u003e290.3 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystematic name\u003c\/td\u003e\n\u003ctd\u003e4-hydroxy-N-[(E)-naphthalen-2-ylmethylideneamino]benzamide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInChIKey\u003c\/td\u003e\n\u003ctd\u003eRNZIMBFHRXYRLL-XDHOZWIPSA-N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eAlthough it is sold beside peptides, SLU-PP-332 is a small organic molecule with no amino acids in it.\u003c\/p\u003e\n\u003ch3\u003eWhat the published research reports\u003c\/h3\u003e\n\u003cp\u003eThe first paper, in ACS Chemical Biology in 2023, reported that the compound increased mitochondrial function in a muscle cell line and, in mice, increased the proportion of oxidative type IIa muscle fibres and treadmill endurance; the authors reported that activation of ERR alpha specifically was critical for the endurance effect. In 2024 the group followed with diet-induced obese and ob\/ob mice, reporting higher energy expenditure and fatty acid oxidation, less fat mass and improved insulin sensitivity. Three of the authors of the first paper declared shareholdings in a company working on ERR-based therapeutics.\u003c\/p\u003e\n\u003cp\u003eTwo further mouse studies looked beyond muscle. In a 2024 Circulation paper, a Baylor College of Medicine team tested SLU-PP-332 and a second agonist, SLU-PP-915, in mice with heart failure induced by pressure overload; both compounds were associated with higher ejection fraction, less fibrosis and longer survival, and genetic experiments pointed to ERR gamma as the main mediator. One author declared a co-founder role in a company developing such compounds. In a 2023 study in the American Journal of Pathology, 21-month-old mice treated for eight weeks showed reversal of age-related albuminuria, podocyte loss and inflammatory markers in the kidney. Both are disease models in animals, not evidence about healthy people.\u003c\/p\u003e\n\u003cp\u003eThere is no human data of any kind, no human pharmacokinetic study, and no safety study in people. It is one of the newest compounds in this market and one of the least characterised. Nothing above is a claim about this product.\u003c\/p\u003e\n\u003ch2\u003eThis listing\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eManufacturer: Thoroughbred Labs\u003c\/li\u003e\n\u003cli\u003eCompound: SLU-PP-332\u003c\/li\u003e\n\u003cli\u003eForm: Capsules\u003c\/li\u003e\n\u003cli\u003ePack size: 60 capsules\u003c\/li\u003e\n\u003cli\u003eStrength: 250 mcg per capsule, the Thoroughbred Labs FACTS panel figure (panel footnote: updated 28\/07\/25); 15 mg per tub as labelled\u003c\/li\u003e\n\u003cli\u003eBatch certificate of analysis: shown where Thoroughbred Labs supplies one for the batch we hold\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAt a stated 250 mcg per capsule the tub holds 15 mg as labelled, which places it between the \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-100-mcg-60-caps\"\u003eBioLab 100 mcg\u003c\/a\u003e and \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-200-mcg-60-caps\"\u003e200 mcg\u003c\/a\u003e listings and the \u003ca href=\"\/en-ro\/products\/biolab-metabolic-boost-slu-pp-332-500-mcg-60-caps\"\u003e500 mcg\u003c\/a\u003e listing on stated content per pack. Thoroughbred Labs also sells SLU-PP-332 in a two-product pack with 5-Amino-1MQ, listed separately as the \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-research-system-slu-pp-332-amp-5-amino-1mq-ndash-thoroughbred-labs\"\u003eResearch System\u003c\/a\u003e; each compound in it is a separate research substance, and we make no claim about using them together.\u003c\/p\u003e\n\u003ch2\u003eSLU-PP-332 in the UK: buying, legal status and what to check\u003c\/h2\u003e\n\u003ch3\u003eWhere the law stands\u003c\/h3\u003e\n\u003cp\u003eSLU-PP-332 is not a licensed medicine in the UK, has not been assessed by the MHRA, and is not an authorised food supplement. It is not a controlled drug under the Misuse of Drugs Act. No medicine containing it has been approved by any regulator, so no UK prescriber or pharmacy can supply it as a treatment, and any listing that sells it as a supplement, a slimming aid or an endurance product is describing something it cannot lawfully be. It may be sold to adults for laboratory research, which is the only basis for this listing. It is not for human consumption. In sport it is prohibited at all times under WADA section S0, covered below. Our \u003ca href=\"\/en-ro\/blogs\/news\/what-are-sarms-the-2026-research-guide\"\u003eresearch guide\u003c\/a\u003e covers the wider legal picture for research compounds.\u003c\/p\u003e\n\u003ch3\u003eSigns of a documented listing\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eA manufacturer is named on the pack and on the page, and the UK seller can be contacted.\u003c\/li\u003e\n\u003cli\u003eThe stated strength per capsule, with its unit, appears on the label; here it is 250 mcg, printed on the tub's side FACTS panel.\u003c\/li\u003e\n\u003cli\u003eA lot number is printed on the tub, and any certificate offered carries that same number.\u003c\/li\u003e\n\u003cli\u003eThe listing gives no directions for use, no quantities per day and no promised outcomes; research-use and 18+ terms are stated.\u003c\/li\u003e\n\u003cli\u003eDelivery is tracked, the packaging is plain, and the returns terms are published.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eHow this listing measures up\u003c\/h3\u003e\n\u003cp\u003eThe manufacturer is named, and the strength is taken from the brand's FACTS panel rather than from a guess. The certificate position depends on what Thoroughbred Labs has supplied for the batch in stock, and a certificate is shown only where one is held for that batch. The seller is named: FreeMuscle, registered in Andorra, with UK operations and dispatch in Scunthorpe. UK orders go by free tracked delivery in plain packaging, orders placed before 2pm Monday to Friday are processed the same working day, EU delivery takes 3-7 working days, and unopened items can be returned within 30 days (see \u003ca href=\"\/en-ro\/pages\/shipping\"\u003edelivery\u003c\/a\u003e and \u003ca href=\"\/en-ro\/pages\/guarantee\"\u003ereturns\u003c\/a\u003e). The \u003ca href=\"\/en-ro\/blogs\/news\/how-to-choose-a-sarms-supplier-uk-checklist\"\u003eUK supplier checklist\u003c\/a\u003e goes into more detail.\u003c\/p\u003e\n\u003ch2\u003eCapsules compared with other forms\u003c\/h2\u003e\n\u003cp\u003eSearches for \"SLU-PP-332 capsules\" and \"SLU-PP-332 injectable\" ask whether form matters. No published study reports results for SLU-PP-332 given as a swallowed capsule. In a 2026 paper its developers stated that SLU-PP-332 lacks oral bioavailability, and they described a chemically distinct agonist, SLU-PP-915, as orally bioavailable in mice. How much of a capsule's content would survive digestion and absorption in any species has not been measured, so we draw no conclusion about form and effect.\u003c\/p\u003e\n\u003cp\u003ePeptides face a different problem: protein-digesting enzymes in the gut break most of them down, as our article \u003ca href=\"\/en-ro\/blogs\/news\/do-oral-peptides-work\"\u003edo oral peptides work\u003c\/a\u003e explains. That argument does not transfer to SLU-PP-332, which is not a peptide; its limitation, as the developers describe it, is a lack of oral bioavailability. The hydrazone link can also be split by acid and water, a point that bears on stomach conditions and on storage alike.\u003c\/p\u003e\n\u003cp\u003eThe forms do differ in ways that can be measured on the bench:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapsules\u003c\/strong\u003e contain a weighed fill of powder, usually the active blended with an inert carrier. The quantity per capsule depends on the fill weight and the evenness of the blend, and only a content assay can check it against the 250 mcg on the label.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolutions\u003c\/strong\u003e are measured by volume. Their accuracy depends on the compound staying dissolved and chemically intact, and a hydrazone held in water is exposed to slow hydrolysis.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSLU-PP-332 compared with Cardarine\u003c\/h2\u003e\n\u003cp\u003eThe related compound people search for most often next to SLU-PP-332 is \u003ca href=\"\/en-ro\/collections\/cardarine\"\u003eCardarine (GW-501516)\u003c\/a\u003e. Both are nuclear-receptor agonists that changed running capacity in mice, hence the shared exercise mimetic label, but their receptors, chemistry and histories differ.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSLU-PP-332\u003c\/th\u003e\n\u003cth\u003eCardarine (GW-501516)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eReceptor\u003c\/td\u003e\n\u003ctd\u003eERR alpha, beta and gamma\u003c\/td\u003e\n\u003ctd\u003ePPAR-delta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemical class\u003c\/td\u003e\n\u003ctd\u003eAcyl hydrazone\u003c\/td\u003e\n\u003ctd\u003ePhenoxyacetic acid with a thiazole ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormula and mass\u003c\/td\u003e\n\u003ctd\u003eC18H14N2O2, 290.3 g\/mol\u003c\/td\u003e\n\u003ctd\u003eC21H18F3NO3S2, 453.5 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeveloped by\u003c\/td\u003e\n\u003ctd\u003eUniversity researchers, first paper 2023\u003c\/td\u003e\n\u003ctd\u003ePharmaceutical industry, around 2000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHuman studies\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eShort early-phase trials, mostly on blood lipids\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLong-term toxicology\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003ctd\u003eRodent cancer findings; development stopped in 2007\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWADA section\u003c\/td\u003e\n\u003ctd\u003eProhibited at all times; S0 at minimum as a non-approved substance\u003c\/td\u003e\n\u003ctd\u003eS4, hormone and metabolic modulators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eMechanism.\u003c\/strong\u003e ERRs and PPAR-delta both belong to the nuclear receptor superfamily and both switch on genes for fat oxidation and mitochondrial capacity in muscle, but they are separate proteins with separate binding pockets. Neither compound is a variant of the other.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvidence.\u003c\/strong\u003e Cardarine has the longer record. It reached small human trials measuring blood lipids, and its commercial development ended after long-term rodent studies found tumours in several tissues. SLU-PP-332 has a handful of mouse and cell papers and no human or long-term toxicology data at all. Fewer reported problems for the newer compound reflect how little it has been studied, not a better profile.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRegulation.\u003c\/strong\u003e In the UK both are unlicensed and may be sold only for research to adults. In sport both are prohibited at all times, under different sections of the WADA list. No study has compared the two directly, and we do not rank research compounds by effect. Its history is in \u003ca href=\"\/en-ro\/blogs\/news\/cardarine-gw-501516-what-happened-in-development\"\u003ewhat happened in Cardarine's development\u003c\/a\u003e, and a \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-gw501516\"\u003eThoroughbred Labs GW-501516\u003c\/a\u003e listing is also stocked.\u003c\/p\u003e\n\u003ch2\u003eReading the certificate of analysis for this product\u003c\/h2\u003e\n\u003cp\u003eBatches sold under the Free Muscle name are each assayed by Janoshik Analytical, an independent laboratory, and the certificate is emailed on request. Thoroughbred Labs is a third-party manufacturer, so a certificate appears here only when Thoroughbred Labs has supplied one for the exact batch on our shelf. A PDF without a batch number does not qualify, and we will not pass one off as a batch certificate. You can contact us with the product name and lot number to ask what is held for that batch. The document in this listing's gallery is one such report, commissioned by Thoroughbred Labs for batch 0725SLU: analysed on 31 October 2025, it requested a qualitative and quantitative analysis and prints a figure of 277.98 mcg for SLU-PP-332, with a QR code and a verification key, no purity percentage and no unit basis for the figure. Check your tub's batch number against 0725SLU. Fields to look for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdentity method.\u003c\/strong\u003e HPLC with UV detection matches a peak to a reference standard by retention time, which is indirect. LC-MS adds the mass: SLU-PP-332 has a monoisotopic mass of about 290.1, so the protonated ion should appear close to m\/z 291.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurity as a percentage.\u003c\/strong\u003e The main peak's share of the total signal. Secondary peaks may be the other geometric isomer of the hydrazone or its hydrolysis products, the parent hydrazide and aldehyde.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmount per capsule.\u003c\/strong\u003e The line to set against the 250 mcg the label states. Without it, purity alone says nothing about quantity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBatch or lot number.\u003c\/strong\u003e It should match the number on the tub in front of you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLaboratory name and test date.\u003c\/strong\u003e These tell you who did the work and whether the result is recent.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEach gap has a specific meaning. With no identity line, nothing independent confirms the compound; with no content line, the 250 mcg on the label remains unmeasured; with a batch number that does not match, the document describes different material. \u003ca href=\"\/en-ro\/pages\/contact\"\u003eContact us\u003c\/a\u003e with your lot number, and see \u003ca href=\"\/en-ro\/blogs\/news\/how-to-read-a-certificate-of-analysis\"\u003ehow to read a certificate of analysis\u003c\/a\u003e and our \u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003elab tests page\u003c\/a\u003e for a worked example.\u003c\/p\u003e\n\u003ch2\u003eDetection, sport and testing\u003c\/h2\u003e\n\u003cp\u003eAs a substance with no current approval for human therapeutic use, SLU-PP-332 falls at minimum under WADA section S0 (non-approved substances) and is prohibited at all times in sport; the list also has a section for hormone and metabolic modulators, so check the current edition for any specific entry. Anti-doping laboratories have already published in vitro work on its detection. In a 2026 study, a Los Angeles doping-control laboratory incubated the compound with pooled human liver S9 fractions and used liquid chromatography with high-resolution mass spectrometry to identify 22 metabolites, hydroxylated and glucuronide or sulfate conjugated forms among them, several of which the authors proposed as candidate targets for doping control. They noted that further work is needed to confirm the structures.\u003c\/p\u003e\n\u003cp\u003eNo study has measured how long SLU-PP-332 or its metabolites remain in human urine or blood, because it has never been given to people under study conditions. The correct summary is that it is detectable in principle and that no detection window has been established. Under strict liability, an athlete answers for any prohibited substance in a sample. Anyone subject to anti-doping rules should consult the current list, which WADA revises every year.\u003c\/p\u003e\n\u003ch2\u003eStorage, stability and handling\u003c\/h2\u003e\n\u003cp\u003eThoroughbred Labs has not published stability data for these capsules, and no independent stability study of SLU-PP-332 exists, so any expiry date printed on the tub is the only stated limit. The structure of the molecule still indicates what to avoid. The hydrazone bond is the weak point: water can cleave it back to its two starting materials, and acid speeds the reaction. The extended aromatic system absorbs ultraviolet light, which can convert the molecule between its two geometric forms.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKeep the tub sealed, in its original container, in a cool, dry and dark place with a steady temperature, away from radiators, sunlight and steamy rooms.\u003c\/li\u003e\n\u003cli\u003eA chilled tub should warm up with the lid on before opening, to avoid condensation.\u003c\/li\u003e\n\u003cli\u003eHandle opened capsules with gloves, away from food and drink.\u003c\/li\u003e\n\u003cli\u003eStore out of reach of children and pets, and dispose of unwanted material as chemical waste in line with laboratory good practice.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eGlossary\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eERR alpha, beta and gamma\u003c\/strong\u003e: the three oestrogen-related receptors, nuclear receptors that regulate energy metabolism genes and do not bind oestrogen.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNuclear receptor\u003c\/strong\u003e: a protein inside the cell that binds a small molecule and then switches particular genes on or off.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAgonist\u003c\/strong\u003e: a molecule that activates a receptor; a pan-agonist activates all members of a receptor family.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEjection fraction\u003c\/strong\u003e: the share of blood pumped out of the heart's main chamber with each beat, a standard measure in heart failure research.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlbuminuria\u003c\/strong\u003e: albumin in the urine, used in animal and human studies as a marker of kidney damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrazone\u003c\/strong\u003e: a chemical group containing a carbon-nitrogen double bond attached to a second nitrogen, open to hydrolysis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLC-MS\u003c\/strong\u003e: separation by liquid chromatography followed by mass measurement, the firmer of the two usual identity tests.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection S0\u003c\/strong\u003e: the WADA category for pharmacological substances with no current approval for human therapeutic use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout Thoroughbred Labs SLU-PP-332\u003c\/h2\u003e\n\u003cp\u003eOn its own shop Thoroughbred Labs lists this product simply as SLU, 250mcg, 60 Capsules; the code printed on the tub is SLU-PP-332. The brand sells only through thoroughbredlabs.co.uk, a UK site priced in pounds, and gives 24\/7 Billing Limited as its statutory business (company number 14990140; Companies House: active, London registered office, incorporated July 2023). Its menu divides the range into research peptides in vials, encapsulated compounds and Research Systems; SLU-PP-332 appears as capsules and in a Research System with 5-AMINO-1MQ, both of which we stock.\u003c\/p\u003e\n\u003cp\u003eThe side FACTS panel gives SLU-PP-332 250mcg per capsule, names organic rice flour and magnesium stearate as the other ingredients in a vegetarian capsule, and carries a footnote that the panel was updated on 28\/07\/25, so tubs printed before that date may show an earlier version. Among the brand's capsule products, only this one and BPC157 had a content report on its certificate page when we checked on 2 October 2026; the page lists SLU-PP-332 Capsules, batch 0725SLU, and the report, commissioned by the brand from an independent laboratory, is in this listing's gallery. It prints a content figure for SLU-PP-332 and no purity percentage, and the brand says each certificate covers only the batch named on it.\u003c\/p\u003e\n\u003cp\u003eIn our \u003ca href=\"\/en-ro\/collections\/slu-pp-332\"\u003eSLU-PP-332 collection\u003c\/a\u003e this 250 mcg tub sits beside BioLab's 100, 200 and 500 mcg capsules, all 60-capsule packs, so the stated content per tub runs from 6 mg to 30 mg with Thoroughbred Labs at 15 mg. Labelling for the whole range is described in the \u003ca href=\"\/en-ro\/collections\/brand-thoroughbred-labs\"\u003eThoroughbred Labs collection\u003c\/a\u003e. Check a tub by matching its batch number to 0725SLU, or asking us for the document for a later batch, confirming the shrink seal and reading the panel against this page.\u003c\/p\u003e\n\u003cp\u003eSLU-PP-332 is a synthetic agonist of the oestrogen-related receptors with mouse and cell data only, first characterised in 2023; it holds no licence anywhere, is neither medicine nor food in the UK, and WADA's section S0, non-approved substances, prohibits it at all times. Here it is offered to adults for laboratory research alone.\u003c\/p\u003e\n\u003ch2\u003eRelated\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/collections\/slu-pp-332\"\u003eAll brands of SLU-PP-332 we stock, compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/collections\/brand-thoroughbred-labs\"\u003eAll Thoroughbred Labs products\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/slu-pp-332-and-5-amino-1mq-research-guide\"\u003eSLU-PP-332 and 5-Amino-1MQ: research guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/collections\/5-amino-1mq\"\u003e5-Amino-1MQ collection\u003c\/a\u003e and \u003ca href=\"\/en-ro\/collections\/cardarine\"\u003eCardarine collection\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003eBatch testing and certificates of analysis\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/pages\/shipping\"\u003eDelivery\u003c\/a\u003e and \u003ca href=\"\/en-ro\/pages\/guarantee\"\u003ereturns\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eResearch compounds sold by Free Muscle are supplied for laboratory research use only and are not for human consumption. They are not authorised as medicines by the MHRA, EMA or FDA, are not food supplements, and are sold only to adults aged 18 or over. Nothing on this page is medical or dosing advice. Summaries of published research describe study findings and are not claims about any product.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eReferences\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eBillon C, et al. Synthetic ERRalpha\/beta\/gamma Agonist Induces an ERRalpha-Dependent Acute Aerobic Exercise Response and Enhances Exercise Capacity. ACS Chem Biol. 2023;18(4):756-771. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/36988910\/\" rel=\"noopener\"\u003ePMID: 36988910\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eBillon C, et al. A Synthetic ERR Agonist Alleviates Metabolic Syndrome. J Pharmacol Exp Ther. 2024;388(2):232-240. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/37739806\/\" rel=\"noopener\"\u003ePMID: 37739806\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eXu W, et al. Novel Pan-ERR Agonists Ameliorate Heart Failure Through Enhancing Cardiac Fatty Acid Metabolism and Mitochondrial Function. Circulation. 2024;149(3):227-250. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/37961903\/\" rel=\"noopener\"\u003ePMID: 37961903\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eWang XX, et al. Estrogen-Related Receptor Agonism Reverses Mitochondrial Dysfunction and Inflammation in the Aging Kidney. Am J Pathol. 2023;193(12):1969-1987. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/37717940\/\" rel=\"noopener\"\u003ePMID: 37717940\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAvliyakulov NK, et al. Analysis and Identification of In Vitro Metabolites of Exercise Mimetic SLU-PP-332 ERRalpha\/beta\/gamma Agonist for Doping-Control Purposes. Drug Test Anal. 2026;18(3):439-450. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/41688415\/\" rel=\"noopener\"\u003ePMID: 41688415\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eBillon C, et al. An orally active estrogen receptor-related receptor agonist, SLU-PP-915, enhances aerobic exercise capacity. J Pharmacol Exp Ther. 2026;393(1):103787. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/41421047\/\" rel=\"noopener\"\u003ePMID: 41421047\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Thoroughbred Labs","offers":[{"title":"Default Title","offer_id":48468981186786,"sku":null,"price":68.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/3499\/5426\/files\/SLU_1f1987af-75f7-47ee-ac58-680c04a3d1b4.png?v=1789931434"}],"url":"https:\/\/freemuscle.co.uk\/en-ro\/collections\/slu-pp-332.oembed","provider":"Free Muscle","version":"1.0","type":"link"}