{"title":"TB-500 (Thymosin Beta-4)","description":"\u003cp\u003eTB-500, also sold as thymosin beta-4 or Tβ4 and sometimes written TB500, is a synthetic peptide based on the actin-binding region of thymosin beta-4, a 43-amino-acid protein present in almost every cell of the body. It is studied in animal and cell models of wound repair and cell migration, and no version of it is an approved medicine. This page lists every brand of TB-500 stocked at Free Muscle, compared on pack size, form and batch testing, with links to the research and to the certificate for each batch.\u003c\/p\u003e\n\u003ch2\u003eWhat is TB-500?\u003c\/h2\u003e\n\u003cp\u003eThymosin beta-4 is the body's main actin-sequestering protein. By binding G-actin it regulates how cells build their internal skeleton, which in turn affects cell migration, blood vessel formation and the inflammatory response. The product sold as TB-500 is not the full protein. Anti-doping chemists who characterised commercial TB-500 found it to be a short, N-terminally acetylated fragment covering residues 17 to 23 of thymosin beta-4, the segment that carries the actin-binding motif (Esposito 2012). That distinction matters, because most of the published biology concerns the full 43-residue protein rather than the fragment.\u003c\/p\u003e\n\u003cp\u003eFull-length thymosin beta-4, international non-proprietary name timbetasin, has been given to people in a few small trials. An intravenous study in 40 healthy volunteers, with placebo in each cohort, found adverse events infrequent and mild or moderate, none serious, after single and then repeated administration over 14 days (Ruff 2010). A phase 2 trial of eye drops in nine people with severe dry eye found less discomfort and corneal staining than with vehicle drops, on 12 treated eyes against six (Sosne 2015). Nothing has been approved.\u003c\/p\u003e\n\u003cp\u003eThe fragment sold as TB-500 has no published human data at all, and the US FDA has stated that it identified no human exposure data for it. It is not a licensed medicine in the UK, the EU or the United States. Thymosin beta-4 and its derivatives, with TB-500 named as an example, are prohibited at all times under WADA class S2 (peptide hormones, growth factors and related substances).\u003c\/p\u003e\n\u003cp\u003ePubChem records TB-500 under CID 62707662 and CAS number 885340-08-9: the N-acetylated seven-residue fragment Ac-LKKTETQ, formula C38H68N10O14, molecular weight 889.0 g\/mol. Full-length thymosin beta-4 is a separate entry, CID 16132341 and CAS 77591-33-4, with the formula C212H350N56O78S and a molecular weight of about 4,963 g\/mol.\u003c\/p\u003e\n\u003ch2\u003eWhat the published research reports\u003c\/h2\u003e\n\u003cp\u003eA 1999 study reported that topical or intraperitoneal thymosin beta-4 accelerated closure of full-thickness skin wounds in rats, with increased collagen deposition and keratinocyte migration (Malinda 1999). A 2004 study in Nature reported that thymosin beta-4 activated integrin-linked kinase, promoted cardiac cell migration and survival, and improved cardiac function after experimentally induced myocardial infarction in mice (Bock-Marquette 2004). A 2005 review summarised the protein's actin-sequestering role and its wound-repair activity across animal models (Goldstein 2005). All of this used the full protein, in animals, at doses and routes with no relation to any capsule product. The human studies of the full protein, an intravenous safety study and a small eye-drop trial (Ruff 2010; Sosne 2015), did not test the TB-500 fragment or any oral form, and no thymosin beta-4 product has been approved.\u003c\/p\u003e\n\u003cp\u003eThe other body of literature is analytical. The Ghent anti-doping laboratory identified the acetylated fragment in a TB-500 product, synthesised it as a reference and set out an LC-MS approach to detecting it in urine and plasma (Esposito 2012). After a single administration to horses, a Hong Kong racing laboratory found the fragment and its metabolites in both urine and plasma (Ho 2012).\u003c\/p\u003e\n\u003cp\u003eA French racing laboratory noted that products sold online claim to contain either the fragment or the full protein, and showed that a synthesis impurity could be detected in a horse's plasma after one administration of a thymosin beta-4 product (Delcourt 2025). These studies say nothing about the products on this page.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMalinda KM, et al. Thymosin beta4 accelerates wound healing. J Invest Dermatol. 1999;113(3):364-368. PMID: 10469335.\u003c\/li\u003e\n\u003cli\u003eBock-Marquette I, et al. Thymosin beta4 activates integrin-linked kinase and promotes cardiac cell migration, survival and cardiac repair. Nature. 2004;432(7016):466-472. PMID: 15565145.\u003c\/li\u003e\n\u003cli\u003eGoldstein AL, Hannappel E, Kleinman HK. Thymosin beta4: actin-sequestering protein moonlights to repair injured tissues. Trends Mol Med. 2005;11(9):421-429. PMID: 16099219.\u003c\/li\u003e\n\u003cli\u003eEsposito S, et al. Synthesis and characterization of the N-terminal acetylated 17-23 fragment of thymosin beta 4 identified in TB-500. Drug Test Anal. 2012;4(9):733-738. PMID: 22962027.\u003c\/li\u003e\n\u003cli\u003eHo EN, et al. Doping control analysis of TB-500, a synthetic version of an active region of thymosin β4, in equine urine and plasma by liquid chromatography-mass spectrometry. J Chromatogr A. 2012;1265:57-69. PMID: 23084823.\u003c\/li\u003e\n\u003cli\u003eRuff D, et al. A randomized, placebo-controlled, single and multiple dose study of intravenous thymosin beta4 in healthy volunteers. Ann N Y Acad Sci. 2010;1194:223-229. PMID: 20536472.\u003c\/li\u003e\n\u003cli\u003eSosne G, Dunn SP, Kim C. Thymosin β4 significantly improves signs and symptoms of severe dry eye in a phase 2 randomized trial. Cornea. 2015;34(5):491-496. PMID: 25826322.\u003c\/li\u003e\n\u003cli\u003eDelcourt V, et al. Equine Doping Controls of Thymosin β4: A Population Study and Strategy for Misuse Detection. Drug Test Anal. 2025;17(7):1071-1077. PMID: 39314109.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBrands of TB-500 we stock\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/products\/tb-500-thymosin-beta-4-peptide-free-muscle\"\u003eFree Muscle TB-500 Thymosin Beta-4, 60 capsules\u003c\/a\u003e. Free Muscle brand, capsule form, 60 capsules per pack. Every batch is assayed by Janoshik Analytical and the certificate for the batch you hold is sent on request.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/products\/thoroughbred-labs-tb500-peptide-capsule-ndash-thoroughbred-labs\"\u003eThoroughbred Labs TB-500 Peptide Capsules\u003c\/a\u003e. 60 capsules. Thoroughbred Labs states 300 mcg (0.3 mg) per capsule, which is 18 mg per pack. A COA is shown where Thoroughbred Labs supplies one for the batch we hold.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/products\/yakka-strength-yakka-strength-tb500-peptide-capsules\"\u003eYakka Strength TB-500 Peptide Capsules\u003c\/a\u003e. 60 capsules. Yakka Strength states 250 mcg (0.25 mg) per capsule, which is 15 mg per pack. A COA is shown where Yakka Strength supplies one for the batch we hold.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAll three listings are capsules, but every published TB-500 or thymosin beta-4 study gave the peptide by infusion, eye drop, skin application or injection, never by mouth, so no study result describes a capsule. The \u003ca href=\"\/en-ro\/products\/tb-500-thymosin-beta-4-peptide-free-muscle\"\u003eFree Muscle TB-500 page\u003c\/a\u003e compares capsules with vials, and our guide \u003ca href=\"\/en-ro\/blogs\/news\/do-oral-peptides-work\"\u003eDo oral peptides actually work?\u003c\/a\u003e explains what happens to peptides taken by mouth.\u003c\/p\u003e\n\u003ch3\u003eHow to compare them\u003c\/h3\u003e\n\u003cp\u003eWhere a strength per capsule is published, multiply it by the capsule count to get total milligrams and divide the price by that number for cost per milligram. Thoroughbred Labs states 300 mcg and Yakka Strength 250 mcg per capsule, so that arithmetic is possible for both. Where no strength is published, as with the Free Muscle listing here, the honest comparison is on documentation: whether an independent laboratory has tested the exact batch on sale, and whether the certificate names the batch number, the method, the purity found and a mass that matches the fragment rather than the full protein.\u003c\/p\u003e\n\u003cp\u003eAsk for the certificate before you buy rather than after. Our \u003ca href=\"\/en-ro\/blogs\/news\/how-to-choose-a-sarms-supplier-uk-checklist\"\u003eUK supplier checklist\u003c\/a\u003e sets out the other checks worth making on any listing.\u003c\/p\u003e\n\u003ch2\u003eBatch testing and certificates of analysis\u003c\/h2\u003e\n\u003cp\u003eA certificate of analysis (COA) sets out a laboratory's findings for a single manufactured batch: identity and purity (usually by HPLC and LC-MS), batch number, test date and laboratory. Free Muscle TB-500 is assayed batch by batch at Janoshik Analytical, an independent laboratory, and we email the certificate for your batch on request when you send the batch number from the label. Thoroughbred Labs and Yakka Strength listings display a COA only if the manufacturer has issued one covering the batch in stock; otherwise the field stays blank.\u003c\/p\u003e\n\u003cp\u003eFor TB-500 the identity result is the line to read first. The mass should match the acetylated seven-residue fragment, 889.0 g\/mol (PubChem CID 62707662), not the 43-residue protein at about 4,963, because products sold online have claimed either one (Delcourt 2025). Without a batch number, a test date and a laboratory name, a report does not qualify as a batch certificate; the other points worth checking are listed on our \u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003elab tests page\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhere to buy TB-500 in the UK: how to check a supplier\u003c\/h2\u003e\n\u003cp\u003eWhichever shop you buy TB-500 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. Every Free Muscle-brand batch is assayed by Janoshik Analytical, and we send the certificate for your batch on request. For Thoroughbred Labs and Yakka Strength, 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-free-muscle\"\u003eFree Muscle\u003c\/a\u003e, \u003ca href=\"\/en-ro\/collections\/brand-thoroughbred-labs\"\u003eThoroughbred Labs\u003c\/a\u003e and \u003ca href=\"\/en-ro\/collections\/brand-yakka-strength\"\u003eYakka Strength\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\u003eTB-500 is not a licensed medicine in the UK and has no MHRA marketing authorisation. It is not an authorised food supplement and may not be sold for human consumption. It is supplied for laboratory research to adults aged 18 and over and is not a controlled drug. In sport it is prohibited at all times under WADA class S2, which names thymosin beta-4 and its derivatives, including TB-500, explicitly. For background on how peptides and SARMs are classified, see our \u003ca href=\"\/en-ro\/blogs\/news\/sarms-vs-peptides-choosing-by-goal\"\u003eSARMs versus peptides guide\u003c\/a\u003e.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eWhere\u003c\/th\u003e\n\u003cth\u003eStatus of TB-500 (checked October 2026)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003ctd\u003eNot listed under the Misuse of Drugs Act 1971. No marketing authorisation; under regulation 46 of the Human Medicines Regulations 2012 an unauthorised medicinal product may not be sold or supplied, which rules out selling it as a medicine or for people to take.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEuropean Union\u003c\/td\u003e\n\u003ctd\u003eNo version is an approved medicine.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003ctd\u003eNot FDA-approved. The FDA's compounding safety-risk page (last updated 22 April 2026) lists thymosin beta-4 fragment (LKKTETQ), also known as TB-500, among withdrawn nominations, citing possible immune reactions from aggregation, peptide impurities and no human exposure data identified.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSport\u003c\/td\u003e\n\u003ctd\u003eWADA class S2.3, growth factors and growth factor modulators, on the 2026 Prohibited List: thymosin beta-4 and its derivatives, a group for which TB-500 is the example given. Prohibited at all times; S2 substances are non-Specified. Horseracing and equestrian federations also forbid thymosin beta-4 (Delcourt 2025).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eStorage and handling\u003c\/h2\u003e\n\u003cp\u003eKeep the container sealed, in a cool, dry place away from direct light, and return it there each time the container has been opened. Do not decant into unlabelled containers. Keep out of the reach of children and animals. Handle in line with ordinary laboratory good practice, with gloves and a clean work surface, and dispose of unwanted material through an appropriate waste route rather than down the sink.\u003c\/p\u003e\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 with nothing on the outside to say what is inside. Orders placed before 2pm Monday to Friday are processed the same working day. EU delivery takes three to seven working days. Unopened items can be returned within 30 days. Customers must be 18 or over. Full details are on our \u003ca href=\"\/en-ro\/pages\/shipping\"\u003eshipping page\u003c\/a\u003e and our \u003ca href=\"\/en-ro\/pages\/guarantee\"\u003eguarantee page\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eRelated reading\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/bpc-157-vs-tb-500-what-the-studies-compared\"\u003eBPC-157 vs TB-500: what the studies compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/tb-500-thymosin-beta-4-research-guide\"\u003eTB-500 and thymosin beta-4: research summary and UK status\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/do-oral-peptides-work\"\u003eDo oral peptides actually work? The honest answer\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/bpc-157-what-research-shows\"\u003eBPC-157: what the research actually shows, and what it does not\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\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\n\u003ca href=\"\/en-ro\/collections\/bpc-157\"\u003eBPC-157\u003c\/a\u003e, \u003ca href=\"\/en-ro\/collections\/bpc-150\"\u003eBPC-150\u003c\/a\u003e, \u003ca href=\"\/en-ro\/collections\/peptides\"\u003eall peptides\u003c\/a\u003e and \u003ca href=\"\/en-ro\/collections\/igf-1-lr3\"\u003eIGF-1 LR3\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.\u003c\/em\u003e\u003c\/p\u003e","products":[{"product_id":"tb-500-thymosin-beta-4-peptide-free-muscle","title":"TB-500 — Thymosin Beta-4 · 60 Capsules","description":"\u003cp\u003e\u003cstrong\u003eTB-500 (Thymosin Beta-4), 60 capsules.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA synthetic fragment related to thymosin beta-4, a protein involved in cell migration and repair. Human clinical evidence is limited; most citations are animal or in-vitro work. Long-term safety in humans has not been established.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIt is a capsule, and peptides taken by mouth are largely broken down by digestive enzymes before absorption.\u003c\/strong\u003e That is why clinical work on this class uses injection. We are not going to claim a capsule matches that.\u003c\/p\u003e\u003cp\u003eIt is \u003cstrong\u003enot authorised as a medicine or a food supplement in the UK or EU\u003c\/strong\u003e, and thymosin beta-4 is on the WADA Prohibited List.\u003c\/p\u003e\u003cp\u003eIdentity and purity are verified per batch by Janoshik Analytical, an independent laboratory. Certificate of Analysis available on request.\u003c\/p\u003e\u003cp\u003e\u003csmall\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\/small\u003e\u003c\/p\u003e","brand":"FreeMuscle","offers":[{"title":"Default Title","offer_id":46946620735714,"sku":"10000004","price":39.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/3499\/5426\/files\/openart-image_XRygvY8P_1760830816393_raw.jpg?v=1766262570"},{"product_id":"thoroughbred-labs-tb500-peptide-capsule-ndash-thoroughbred-labs","title":"Thoroughbred Labs TB-500 Peptide Capsules","description":"\u003cp\u003e\u003cstrong\u003eThoroughbred Labs TB-500 Peptide Capsules\u003c\/strong\u003e is a listing of TB-500, a peptide based on thymosin beta-4, supplied as 60 capsules per pack, with a stated strength of 300 mcg per capsule printed by Thoroughbred Labs on the tub's side panel and given in its product title. 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 TB-500 and thymosin beta-4 reports, what the label documents, the UK legal and anti-doping position, how capsules differ from other formats, and how batch certificates are handled for Thoroughbred Labs products.\u003c\/p\u003e\n\u003ch2\u003eAbout TB-500\u003c\/h2\u003e\n\u003cp\u003eTB-500 is the name used in the research-compound market for synthetic peptides based on thymosin beta-4, a 43-amino-acid protein present in most human cells. Products sold as TB-500 may contain the full sequence or a shorter fragment around the actin-binding region; the label on this listing does not say which. Thymosin beta-4 binds monomeric actin and has been studied in cell migration, angiogenesis and wound repair models. It is a peptide, not a steroid and not a SARM: it has no steroid ring structure and does not act on the androgen receptor.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eIdentifier\u003c\/th\u003e\n\u003cth\u003eThymosin beta-4 (parent protein)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e43 amino acids\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular formula\u003c\/td\u003e\n\u003ctd\u003eC212H350N56O78S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular weight\u003c\/td\u003e\n\u003ctd\u003eabout 4,963 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePubChem CID\u003c\/td\u003e\n\u003ctd\u003e45382195\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInChIKey\u003c\/td\u003e\n\u003ctd\u003eUGPMCIBIHRSCBV-UHFFFAOYSA-N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActin-binding segment\u003c\/td\u003e\n\u003ctd\u003eresidues 17 to 23, LKKTETQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhat the published research reports\u003c\/h3\u003e\n\u003cp\u003eA 2012 review by Goldstein and colleagues summarised the peptide's properties and the clinical programmes then under way in wounds, the cornea and cardiac repair. A 2010 randomised, placebo-controlled study gave intravenous pharmaceutical-grade thymosin beta-4 to healthy volunteers as single and repeated doses and reported no serious adverse events across the range tested; it was a tolerability study, not an efficacy study, and it used injection rather than a capsule. None of those programmes has produced an approved medicine, and no published human work shows that a peptide of this size survives oral administration.\u003c\/p\u003e\n\u003cp\u003eTwo analytical papers from 2012 describe what TB-500 products have actually contained. The doping control laboratory at Ghent University examined a TB-500 formulation by high-resolution mass spectrometry and identified the N-terminally acetylated 17-23 fragment of thymosin beta-4 in it. In the same year the racing laboratory of the Hong Kong Jockey Club described TB-500 as a veterinary preparation whose key ingredient was that acetylated seven-residue peptide, and published a method for finding it and its metabolites in horse urine and plasma. Both studies concern other products and animals, not this pack. 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: TB-500 (Thymosin Beta-4)\u003c\/li\u003e\n\u003cli\u003eForm: Capsules\u003c\/li\u003e\n\u003cli\u003ePack size: 60 capsules\u003c\/li\u003e\n\u003cli\u003eStrength: 300 mcg per capsule, as Thoroughbred Labs states on the FACTS panel\u003c\/li\u003e\n\u003cli\u003eTotal per pack: 60 x 300 mcg, 18 mg 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\u003eWith 300 mcg per capsule stated, the tub holds 18 mg of peptide as labelled, against 250 mcg per capsule stated for the \u003ca href=\"\/en-ro\/products\/yakka-strength-yakka-strength-tb500-peptide-capsules\"\u003eYakka Strength TB-500 capsules\u003c\/a\u003e we also stock. Our article on \u003ca href=\"\/en-ro\/blogs\/news\/price-per-mg-compare-sarms-peptides\"\u003eprice per milligram\u003c\/a\u003e explains how to set such figures side by side, and why a stated figure is only a label claim until a batch document measures it.\u003c\/p\u003e\n\u003ch2\u003eTB-500 in the UK: buying, legal status and what to check\u003c\/h2\u003e\n\u003cp\u003eSearches for \"buy TB 500 UK\" and \"TB 500 legal UK\" ask two things: may it be sold here, and how to tell a documented listing from an undocumented one.\u003c\/p\u003e\n\u003ch3\u003eThe legal position\u003c\/h3\u003e\n\u003cp\u003eTB-500 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 either. UK law turns on how a product is presented: anything offered to treat or prevent a condition is regulated as a medicine, and anything offered to be eaten must meet food law. TB-500 meets neither framework, so the only basis for this listing is supply for laboratory research to adults aged 18 and over, not for human consumption. No thymosin beta-4 medicine holds a UK marketing authorisation. Thymosin beta-4 and its derivatives, with TB-500 named as an example, are listed under section S2 (peptide hormones, growth factors and related substances) of the WADA Prohibited List and are prohibited at all times in sport. 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\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eA named maker and a named seller\u003c\/strong\u003e, so there is someone accountable for the label and someone to contact about the order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA batch or lot number\u003c\/strong\u003e on the container. Analytical results belong to a batch, never to a product name.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA certificate of analysis for that batch\u003c\/strong\u003e, issued by a named laboratory, with a matching lot number.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA stated strength\u003c\/strong\u003e, or a plain statement that the manufacturer gives none.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResearch-only wording\u003c\/strong\u003e: sale to adults only, with no usage directions and nothing promising a result.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTracked delivery in plain packaging\u003c\/strong\u003e and a written returns policy.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eWhere this Thoroughbred Labs pack stands\u003c\/h3\u003e\n\u003cp\u003eThe seller is named: FreeMuscle, registered in Andorra, with UK operations and dispatch in Scunthorpe. The manufacturer is named, sale is limited to adults and this page contains no directions for use. 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, and unopened items can be returned within 30 days. Two checks depend on Thoroughbred Labs rather than on us. The fourth point is met, with 300 mcg per capsule stated on the FACTS panel, and a batch certificate is shown only when the brand has supplied one for the lot we hold; as checked on 2 October 2026, the brand's own certificate page listed none for its TB500 capsules. The full set of checks is in our \u003ca href=\"\/en-ro\/blogs\/news\/how-to-choose-a-sarms-supplier-uk-checklist\"\u003eUK supplier checklist\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eCapsules compared with other forms\u003c\/h2\u003e\n\u003cp\u003eTB-500 is offered as capsules and tablets, as freeze-dried powder in sealed vials, and occasionally as ready-mixed solution. The published work on thymosin beta-4 used routes that bypass digestion: intravenous infusion in the healthy-volunteer study, eye drops and topical gels in the corneal and skin programmes, and injection in most animal models. No study has measured whether any intact TB-500 peptide reaches the blood of a person after a capsule is swallowed.\u003c\/p\u003e\n\u003cp\u003eThe reason is digestive chemistry. The stomach's pepsin and the pancreatic and brush-border peptidases of the small intestine exist to break peptide bonds, and a short linear chain such as LKKTETQ, rich in lysine residues that trypsin cleaves next to, is an ordinary substrate. Crossing the gut wall would be a second, separate hurdle.\u003c\/p\u003e\n\u003cp\u003eAs materials, the formats differ in two practical ways. Stability: dry powder, whether in a capsule or a vial, keeps better than peptide dissolved in water, where hydrolysis and microbial growth begin. Uniformity: a capsule's content depends on how evenly a small amount of peptide was blended with filler before filling, while a solution's depends on how accurately it was made up and measured out. None of this implies that any format produces an effect. The wider question is covered in \u003ca href=\"\/en-ro\/blogs\/news\/do-oral-peptides-work\"\u003edo oral peptides actually work\u003c\/a\u003e and, for a related peptide, \u003ca href=\"\/en-ro\/blogs\/news\/bpc-157-capsules-vs-injection-what-studies-used\"\u003eBPC-157 capsules vs injection\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTB-500 compared with BPC-157\u003c\/h2\u003e\n\u003cp\u003e\"TB 500 vs BPC 157\" is the most searched comparison for this compound, and Thoroughbred Labs makes both, but the molecules have nothing in common beyond being peptides sold for repair research.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePoint\u003c\/th\u003e\n\u003cth\u003eTB-500 (thymosin beta-4 based)\u003c\/th\u003e\n\u003cth\u003eBPC-157\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eParent\u003c\/td\u003e\n\u003ctd\u003eThymosin beta-4, an intracellular actin-binding protein\u003c\/td\u003e\n\u003ctd\u003eA protein isolated from gastric juice\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003eFull protein 43 residues; products analysed in 2012 held a 7-residue acetylated fragment\u003c\/td\u003e\n\u003ctd\u003e15 residues, 1419.5 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProposed mechanism\u003c\/td\u003e\n\u003ctd\u003eSequestering monomeric actin, which influences cell migration\u003c\/td\u003e\n\u003ctd\u003eGrowth factor, nitric oxide and cell-signalling pathways in rodent tissue\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHuman data\u003c\/td\u003e\n\u003ctd\u003eSmall early trials of the full protein by infusion or local application; none on the fragment\u003c\/td\u003e\n\u003ctd\u003eNo randomised controlled trial published\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 section\u003c\/td\u003e\n\u003ctd\u003eS2, named among growth factor related substances\u003c\/td\u003e\n\u003ctd\u003eS0, non-approved substances\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThymosin beta-4 has been studied by many independent groups and taken into industry-sponsored clinical programmes, although none reached approval. BPC-157 research comes largely from one university network and remains almost entirely preclinical. Neither body of work concerns capsules, and no study has compared the two peptides directly, so neither can be ranked above the other. Their different WADA sections carry the same practical result: both are banned at all times.\u003c\/p\u003e\n\u003cp\u003eThoroughbred Labs also sells \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-bpc157-peptide-capsule-ndash-thoroughbred-labs\"\u003eBPC-157 capsules\u003c\/a\u003e and a \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-research-system-bpc157-amp-tb500-capsule-ndash-thoroughbred-labs\"\u003eresearch system containing BPC-157 and TB-500\u003c\/a\u003e. That listing is a packaging convenience; we publish no guidance on combining the two and make no claim that they interact. Every BPC-157 brand we hold is on the \u003ca href=\"\/en-ro\/collections\/bpc-157\"\u003eBPC-157 collection page\u003c\/a\u003e, with background in \u003ca href=\"\/en-ro\/blogs\/news\/bpc-157-what-research-shows\"\u003eBPC-157: what the research shows\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eReading the certificate of analysis for this product\u003c\/h2\u003e\n\u003cp\u003eThoroughbred Labs 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 Thoroughbred Labs products we show a certificate of analysis only where the manufacturer 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. Where no batch certificate has been supplied, the listing does not show one.\u003c\/p\u003e\n\u003cp\u003eFor TB-500 the identity line is where a certificate earns its keep, because the name covers two very different molecules. Read each field against the pack:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdentity method.\u003c\/strong\u003e HPLC shows a peak at the retention time of a reference standard. LC-MS adds a measured mass, and here the mass decides what is in the capsule: a result near 4.96 kDa points to full-length thymosin beta-4, while a result under 1 kDa fits the acetylated seven-residue fragment. A certificate naming \"TB-500\" with no mass leaves that question open.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurity percentage.\u003c\/strong\u003e The share of the chromatogram taken by the main peak. It says how clean the peptide is, not how much is in each capsule.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContent per capsule.\u003c\/strong\u003e The field that checks the 300 mcg this label states. It should say whether finished capsules or raw powder were tested.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLot reference and analysis date.\u003c\/strong\u003e The lot on the report should be the one printed on the tub; the date tells you whether the result is current.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLaboratory name.\u003c\/strong\u003e So the result can be checked with whoever issued it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor this brand a missing field has direct consequences: with no mass the molecule is unconfirmed, with no content line the stated 300 mcg stays unmeasured, and with no batch number the report cannot be linked to the capsules in hand. Questions about current stock can go through our \u003ca href=\"\/en-ro\/pages\/contact\"\u003econtact page\u003c\/a\u003e. 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.\u003c\/p\u003e\n\u003ch2\u003eDetection, sport and testing\u003c\/h2\u003e\n\u003cp\u003eThymosin beta-4 and its derivatives sit in section S2 of the WADA Prohibited List, with TB-500 named, and are prohibited in and out of competition. UK Anti-Doping applies the World Anti-Doping Code in the UK, and strict liability means an athlete is responsible for any prohibited substance in a sample regardless of what a label said. Equine anti-doping laboratories test for it too.\u003c\/p\u003e\n\u003cp\u003eMethods exist. The Ghent laboratory synthesised the acetylated fragment and proposed a strategy for detecting it in plasma and urine. The Hong Kong Jockey Club laboratory identified its metabolites in vitro, then confirmed the parent peptide at 0.02 ng\/mL in equine plasma and 0.01 ng\/mL in equine urine, and found it and its metabolites in samples from horses given the preparation. That work was in horses; no published study sets out how long TB-500 remains detectable in people. The accurate position is: detectable, window not established.\u003c\/p\u003e\n\u003ch2\u003eStorage, stability and handling\u003c\/h2\u003e\n\u003cp\u003eNo stability study of TB-500 capsules has been published, so the manufacturer's expiry or best-before date, if printed, is the limit to work to. Thymosin beta-4 contains a methionine residue, which can oxidise, so the practical threats to dry peptide powder are moisture, heat, air and light. Damp also softens capsule shells and makes contents clump.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eClose the lid firmly and store the tub in a dark cupboard, well away from heat sources, steam and direct sun.\u003c\/li\u003e\n\u003cli\u003eLeave any desiccant sachet in the tub. If the pack is kept in a fridge, let it reach room temperature before opening so condensation does not form inside.\u003c\/li\u003e\n\u003cli\u003eDo not decant capsules into another pot: the printed lot number is what links them to any certificate. Only unopened packs qualify for the 30-day return.\u003c\/li\u003e\n\u003cli\u003eTreat the contents as laboratory reagents: gloves for opened capsules, away from food and drink, out of reach of children and animals, and disposal as chemical waste.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eGlossary\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThymosin beta-4\u003c\/strong\u003e: a 43-amino-acid protein found inside most cells, the parent of the peptides sold as TB-500.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActin sequestration\u003c\/strong\u003e: binding of unpolymerised actin so it is held in reserve rather than built into filaments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAngiogenesis\u003c\/strong\u003e: formation of new blood vessels, one of the processes studied in thymosin beta-4 models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eN-terminal acetylation\u003c\/strong\u003e: an acetyl group added to the start of a peptide chain, written \"Ac-\" before the sequence.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeptidase\u003c\/strong\u003e: an enzyme that cuts peptide bonds; the digestive tract contains many.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetabolite\u003c\/strong\u003e: a breakdown product that testing laboratories can look for alongside the parent peptide.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ekDa\u003c\/strong\u003e: kilodalton, a unit of molecular mass equal to 1,000 g\/mol.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet peptide content\u003c\/strong\u003e: the share of a powder that is peptide, after water, salts and filler are excluded.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS2\u003c\/strong\u003e: the part of WADA's list covering peptide hormones and growth factors, under which thymosin beta-4 derivatives are banned.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrict liability\u003c\/strong\u003e: the principle under which a positive sample counts against the athlete whatever its source or intent.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout Thoroughbred Labs TB-500 Peptide Capsules\u003c\/h2\u003e\n\u003cp\u003eBehind the Thoroughbred Labs label is a UK web shop, thoroughbredlabs.co.uk, selling in pounds with no customer-facing premises. The statutory details in its footer point to 24\/7 Billing Limited (number 14990140 on the Companies House register), an active private limited company, London-registered, incorporated in July 2023. The brand's catalogue offers TB500 both as a 10 mg freeze-dried vial and as these capsules, besides blends and Research Systems. Its certificate page carries a report for the vial, batch TBLTB945, and none for the capsules as of 2 October 2026; the vial document describes a different product and is not evidence for what a capsule contains.\u003c\/p\u003e\n\u003cp\u003eOn the tub, TB500 is printed in large type over 60 CAPSULES and the brand's research-only band, with the strength on the side FACTS panel: TB500 300mcg per capsule; the other ingredients listed are organic rice flour and magnesium stearate in a vegetarian capsule. The brand's own product title repeats 300 mcg. The same tub appears in the brand's BPC-157 and TB500 Research System, which we also stock. Because no capsule report has been published, this listing carries no certificate and makes no claim about the identity, purity or content of the batch held; what it records is the brand's stated figure.\u003c\/p\u003e\n\u003cp\u003eTwo other TB-500 capsule listings sit beside this one in the \u003ca href=\"\/en-ro\/collections\/tb-500\"\u003eTB-500 collection\u003c\/a\u003e: \u003ca href=\"\/en-ro\/products\/yakka-strength-yakka-strength-tb500-peptide-capsules\"\u003eYakka Strength\u003c\/a\u003e, which states 250 mcg per capsule, and Free Muscle's own capsules, which carry a Janoshik certificate for every batch. The \u003ca href=\"\/en-ro\/collections\/brand-thoroughbred-labs\"\u003eThoroughbred Labs collection\u003c\/a\u003e describes the brand's labelling conventions and lists which of its capsules have published reports. To check a tub, confirm the shrink seal, read the panel figure against this page, note the batch number and ask us what documentation exists for it.\u003c\/p\u003e\n\u003cp\u003eTB-500 names synthetic peptides derived from thymosin beta-4; the clinical work was on the full protein by injection, no product containing either is licensed, UK law places it outside both medicines and food, and the WADA list places thymosin beta-4 and its derivatives in S2, prohibited at all times. Research use only, adults aged 18 and over.\u003c\/p\u003e\n\u003ch2\u003eRelated\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/collections\/tb-500\"\u003eAll brands of TB-500 we stock, compared\u003c\/a\u003e, including \u003ca href=\"\/en-ro\/products\/yakka-strength-yakka-strength-tb500-peptide-capsules\"\u003eYakka Strength TB-500 capsules\u003c\/a\u003e\n\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\/collections\/peptides\"\u003eResearch peptides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/blogs\/news\/tb-500-thymosin-beta-4-research-guide\"\u003eTB-500 and thymosin beta-4 research guide\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\u003eGoldstein AL, et al. Thymosin beta4: a multi-functional regenerative peptide. Basic properties and clinical applications. Expert Opin Biol Ther. 2012;12(1):37-51. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/22074294\/\" rel=\"noopener\"\u003ePMID: 22074294\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eRuff D, et al. A randomized, placebo-controlled, single and multiple dose study of intravenous thymosin beta4 in healthy volunteers. Ann N Y Acad Sci. 2010;1194:223-9. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/20536472\/\" rel=\"noopener\"\u003ePMID: 20536472\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eEsposito S, et al. Synthesis and characterization of the N-terminal acetylated 17-23 fragment of thymosin beta 4 identified in TB-500, a product suspected to possess doping potential. Drug Test Anal. 2012;4(9):733-8. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/22962027\/\" rel=\"noopener\"\u003ePMID: 22962027\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eHo EN, et al. Doping control analysis of TB-500, a synthetic version of an active region of thymosin β4, in equine urine and plasma by liquid chromatography-mass spectrometry. J Chromatogr A. 2012;1265:57-69. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/23084823\/\" rel=\"noopener\"\u003ePMID: 23084823\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ol\u003e\n","brand":"Thoroughbred Labs","offers":[{"title":"Default Title","offer_id":48468981219554,"sku":null,"price":38.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/3499\/5426\/files\/3D_tb500_use_6f62844a-8e1d-428a-a4b9-fbfe1fcbf3ac.png?v=1789931435"},{"product_id":"yakka-strength-yakka-strength-tb500-peptide-capsules","title":"Yakka Strength TB-500 Peptide Capsules","description":"\u003cp\u003e\u003cstrong\u003eYakka Strength TB-500 Peptide Capsules\u003c\/strong\u003e is a Yakka Strength listing of TB-500, supplied as 60 capsules per pot and stocked through the \u003ca href=\"\/en-ro\/pages\/muscle-market\"\u003eMuscle Market\u003c\/a\u003e range; its facts panel gives 250 mcg of TB500 per capsule, 15 mg per pot as labelled, naming Yakka Strength Ltd as distributor but not which TB-500 molecule is inside. It is sold for laboratory research only, is not for human consumption, and is sold to adults aged 18 and over. This page covers what the published research on TB-500 and thymosin beta-4 reports, what the label documents, the UK and anti-doping position, and how batch certificates are handled for Yakka Strength products.\u003c\/p\u003e\n\u003ch2\u003eAbout TB-500\u003c\/h2\u003e\n\u003cp\u003eTB-500 is the name used in the research-compound market for synthetic peptides based on thymosin beta-4, a 43-amino-acid protein present in most human cells. Products sold as TB-500 may contain the full sequence or a shorter fragment around the actin-binding region; the label on this listing does not say which. Thymosin beta-4 binds monomeric actin and has been studied in cell migration, angiogenesis and wound repair models. It is a peptide, so it is neither a steroid nor a SARM, even though the three are often sold side by side.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eIdentifier\u003c\/th\u003e\n\u003cth\u003eFull thymosin beta-4\u003c\/th\u003e\n\u003cth\u003eFragment found in TB-500 products\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e43 amino acids\u003c\/td\u003e\n\u003ctd\u003e7 amino acids (positions 17 to 23), acetylated at the N-terminus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSequence\u003c\/td\u003e\n\u003ctd\u003eFull protein sequence\u003c\/td\u003e\n\u003ctd\u003eAc-LKKTETQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular formula\u003c\/td\u003e\n\u003ctd\u003eC212H350N56O78S\u003c\/td\u003e\n\u003ctd\u003eC38H68N10O14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular weight\u003c\/td\u003e\n\u003ctd\u003eabout 4,963 g\/mol\u003c\/td\u003e\n\u003ctd\u003eabout 889 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePubChem CID\u003c\/td\u003e\n\u003ctd\u003e45382195\u003c\/td\u003e\n\u003ctd\u003enot listed here\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInChIKey\u003c\/td\u003e\n\u003ctd\u003eUGPMCIBIHRSCBV-UHFFFAOYSA-N\u003c\/td\u003e\n\u003ctd\u003enot listed here\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhat the published research reports\u003c\/h3\u003e\n\u003cp\u003eA 2012 review by Goldstein and colleagues summarised the peptide's properties and the clinical programmes then under way in wounds, the cornea and cardiac repair. A 2010 randomised, placebo-controlled study gave intravenous pharmaceutical-grade thymosin beta-4 to healthy volunteers as single and repeated doses. Adverse events were infrequent and mild or moderate, and none was serious. It was a safety study, not an efficacy study, and it used injection rather than a capsule. None of those programmes has produced an approved medicine, and no published human work shows that a peptide of this size survives oral administration.\u003c\/p\u003e\n\u003cp\u003eThe chemistry of what is actually sold as TB-500 comes mostly from anti-doping laboratories. In 2012 the Ghent doping control laboratory analysed a TB-500 product by high-resolution mass spectrometry and identified the acetylated 17-23 fragment of thymosin beta-4, Ac-LKKTETQ, rather than the whole protein. The same year the Hong Kong Jockey Club's racing laboratory described TB-500 as a veterinary preparation built around that acetylated fragment and published a method that found it, and its breakdown products, in urine and plasma from horses given a single administration. Neither study measured any effect in people. Nothing above is a claim about this product.\u003c\/p\u003e\n\u003ch2\u003eThis listing\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand and distributor: Yakka Strength Ltd, as the back panel states, with \"Made in the UK\" on the facts panel and no manufacturer named\u003c\/li\u003e\n\u003cli\u003eCompound: TB-500 (Thymosin Beta-4)\u003c\/li\u003e\n\u003cli\u003eForm: Capsules\u003c\/li\u003e\n\u003cli\u003ePack size: 60 capsules\u003c\/li\u003e\n\u003cli\u003eStrength: 250 mcg TB500 per capsule, the figure printed on the side facts panel\u003c\/li\u003e\n\u003cli\u003eTotal per pot: 15 mg, as labelled (250 mcg x 60)\u003c\/li\u003e\n\u003cli\u003eWhich peptide: the label does not say whether the capsules hold full thymosin beta-4 or the Ac-LKKTETQ fragment\u003c\/li\u003e\n\u003cli\u003eBatch certificate of analysis: shown where Yakka Strength supplies one for the batch we hold\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWith 15 mg per pot as labelled, the pot can be set against other TB-500 brands that print a figure, although the comparison is only as good as the identity behind it: 250 mcg of a seven-residue fragment and 250 mcg of full thymosin beta-4 are not the same quantity of the same thing. Our \u003ca href=\"\/en-ro\/blogs\/news\/price-per-mg-compare-sarms-peptides\"\u003eprice per milligram guide\u003c\/a\u003e explains the method.\u003c\/p\u003e\n\u003ch2\u003eTB-500 in the UK: buying, legal status and what to check\u003c\/h2\u003e\n\u003cp\u003eUK searches for this peptide cluster around three questions: whether it is legal (\"TB 500 legal UK\"), where it can be bought (\"buy TB 500 UK\", \"TB 500 UK for sale\", \"TB 500 capsules UK\"), and how to judge the seller.\u003c\/p\u003e\n\u003ch3\u003eThe legal position\u003c\/h3\u003e\n\u003cp\u003eTB-500 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 either, which is why it can be supplied at all, but only as a laboratory research material to adults aged 18 and over and never for human consumption. Thymosin beta-4 and its derivatives, with TB-500 named as an example, are listed under section S2 (peptide hormones, growth factors and related substances) of the WADA Prohibited List and are prohibited at all times in sport. 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, and the \u003ca href=\"\/en-ro\/blogs\/news\/tb-500-thymosin-beta-4-research-guide\"\u003eTB-500 and thymosin beta-4 research guide\u003c\/a\u003e covers this peptide in depth.\u003c\/p\u003e\n\u003ch3\u003eWhat a trustworthy UK listing shows\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe peptide identified\u003c\/strong\u003e: whether the product is full thymosin beta-4 or the acetylated fragment, since the two differ roughly fivefold in molecular weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA stated amount per capsule or vial\u003c\/strong\u003e, so a buyer can see what the pack is supposed to contain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTraceability\u003c\/strong\u003e: a lot code printed on every tub, matched by the lot code on its certificate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA named maker and a named business behind the sale\u003c\/strong\u003e, reachable by email.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResearch-only terms\u003c\/strong\u003e: an 18+ restriction, no instructions for use and no promised results.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePlain packaging, tracked delivery and a written returns policy.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow this listing measures up\u003c\/h3\u003e\n\u003cp\u003eFree Muscle is the trading name of FreeMuscle, a business registered in Andorra, with UK operations and dispatch in Scunthorpe. Orders ship by free tracked UK delivery in plain packaging, orders placed before 2pm Monday to Friday are processed the same working day, EU delivery takes three to seven working days, and unopened items can be returned within 30 days. The strength point is met: the label states 250 mcg per capsule. The point not met on the label is the identity of the peptide, which the brand does not specify, and a batch certificate with an identity result is the only document that could settle it; we show one only where Yakka Strength supplies it for the batch we hold, and the brand's own pages show none. More in our \u003ca href=\"\/en-ro\/blogs\/news\/how-to-choose-a-sarms-supplier-uk-checklist\"\u003eUK supplier checklist\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eCapsules compared with other forms\u003c\/h2\u003e\n\u003cp\u003eMost TB-500 on the market is freeze-dried powder in glass vials, often labelled \"10mg\", which is why \"TB 500 10mg UK\" is a common search. Capsules and tablets, as in this listing, are a newer format. The literature shows how each route was studied and where the obstacles lie.\u003c\/p\u003e\n\u003cp\u003eThe human programmes summarised in the 2012 review used intravenous infusion or preparations applied directly to skin or eye. The anti-doping work on the Ac-LKKTETQ fragment used horses given the veterinary preparation, not an oral form. No published study has measured whether either peptide reaches the blood intact after being swallowed. The general obstacle is digestion: stomach and intestinal proteases cleave peptide chains, and a 43-residue protein offers them many sites. Even the 7-residue fragment is a target, and the Hong Kong group's method looked for its metabolites as well as the parent peptide. Our article on \u003ca href=\"\/en-ro\/blogs\/news\/do-oral-peptides-work\"\u003ewhether oral peptides work\u003c\/a\u003e covers the digestion problem across the class.\u003c\/p\u003e\n\u003cp\u003eAs materials the formats differ in handling rather than in molecule. A sealed vial of freeze-dried powder is dry and relatively stable, but once dissolved it becomes vulnerable to hydrolysis and contamination, and any measured volume depends on the mixing. A capsule holds a fixed fill of dry powder, usually with a filler, and its consistency from capsule to capsule depends on how evenly the batch was blended, which only a per-capsule content test can show. None of this implies that any format produces an effect.\u003c\/p\u003e\n\u003ch2\u003eTB-500 compared with BPC-157\u003c\/h2\u003e\n\u003cp\u003eBPC-157 is the peptide most often searched with this one (\"TB 500 vs BPC 157\", \"TB 500 and BPC 157\"). They are sold side by side and sometimes in the same bundle, but they come from unrelated proteins and sit in different parts of the WADA list.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eQuestion\u003c\/th\u003e\n\u003cth\u003eTB-500\u003c\/th\u003e\n\u003cth\u003eBPC-157\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eParent molecule\u003c\/td\u003e\n\u003ctd\u003eThymosin beta-4, an intracellular actin-sequestering protein\u003c\/td\u003e\n\u003ctd\u003eA protein isolated from gastric juice\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWhat is sold\u003c\/td\u003e\n\u003ctd\u003eFull 43-residue protein or the 7-residue Ac-LKKTETQ fragment; labels rarely say which\u003c\/td\u003e\n\u003ctd\u003eA single defined 15-residue sequence, GEPPPGKPADDAGLV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003eAbout 4,963 g\/mol (full) or about 889 g\/mol (fragment)\u003c\/td\u003e\n\u003ctd\u003eAbout 1,419 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHuman research\u003c\/td\u003e\n\u003ctd\u003eFull protein: a volunteer infusion study and early wound and eye programmes. Fragment: none\u003c\/td\u003e\n\u003ctd\u003eNo published randomised controlled trial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUK status\u003c\/td\u003e\n\u003ctd\u003eUnlicensed; research material only\u003c\/td\u003e\n\u003ctd\u003eUnlicensed; research material only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWADA section\u003c\/td\u003e\n\u003ctd\u003eS2, named under thymosin beta-4 and its derivatives\u003c\/td\u003e\n\u003ctd\u003eS0, non-approved substances\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe difference that matters most for a buyer is definition. BPC-157 has one sequence, so a certificate either finds it or does not. TB-500 is a trade name that has been applied to two different molecules, so a certificate must say which one it found before its purity figure means anything. The proposed biology also differs: thymosin beta-4's established role is holding actin in its unpolymerised form, which governs cell movement, while most BPC-157 work comes from rodent gut and tendon models. No human study has compared them, neither can be ranked above the other, and we publish no guidance on using them together. The \u003ca href=\"\/en-ro\/collections\/bpc-157\"\u003eBPC-157 collection\u003c\/a\u003e lists every brand we hold, and \u003ca href=\"\/en-ro\/blogs\/news\/bpc-157-what-research-shows\"\u003eBPC-157: what the research shows\u003c\/a\u003e reviews its evidence.\u003c\/p\u003e\n\u003ch2\u003eReading the certificate of analysis for this product\u003c\/h2\u003e\n\u003cp\u003eYakka Strength 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 Yakka Strength products we show a certificate of analysis only where the manufacturer 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. On a certificate for this pack, check these lines.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdentity and method.\u003c\/strong\u003e LC-MS weighs the molecule and is the stronger test. The Ac-LKKTETQ fragment has a monoisotopic mass of about 888.5, usually seen as an ion near m\/z 889.5 or, doubly charged, near m\/z 445.3. Full thymosin beta-4 is far heavier and appears as a spread of multiply charged ions. HPLC alone only matches a retention time to a reference standard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurity (%).\u003c\/strong\u003e The share of the chromatogram taken by the main peak. It grades cleanliness, not quantity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContent per capsule.\u003c\/strong\u003e The measured amount of peptide in a capsule, the figure the label omits. For peptides, check whether it is net peptide or total powder, since water and acetate counter-ions add weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBatch number.\u003c\/strong\u003e It must match the lot printed on the tub you hold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWho tested it, and when.\u003c\/strong\u003e A named laboratory can be asked to confirm the report; the date shows whether it predates the stock.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor this brand, each missing field has a specific cost. No identity line means the certificate cannot settle whether the product is the fragment or the full protein. No content line means the 250 mcg on the label stays unverified. A different or absent batch number means the report describes other material. \u003ca href=\"\/en-ro\/pages\/contact\"\u003eContact us\u003c\/a\u003e with the lot number for what exists on current stock; our \u003ca href=\"\/en-ro\/pages\/lab-tests\"\u003elab tests page\u003c\/a\u003e and \u003ca href=\"\/en-ro\/blogs\/news\/how-to-read-a-certificate-of-analysis\"\u003eguide to reading a COA\u003c\/a\u003e go further.\u003c\/p\u003e\n\u003ch2\u003eDetection, sport and testing\u003c\/h2\u003e\n\u003cp\u003eWADA names thymosin beta-4 and its derivatives, with TB-500 as the example, in section S2 of the Prohibited List. That section applies in and out of competition, across every sport that has adopted the World Anti-Doping Code, including testing by UK Anti-Doping. Under strict liability an athlete is responsible for any prohibited substance in their sample, whatever the label said.\u003c\/p\u003e\n\u003cp\u003eDetection methods have been published for more than a decade. The Ghent laboratory proposed an LC-MS\/MS strategy for the Ac-LKKTETQ fragment in plasma and urine in 2012, and the Hong Kong racing laboratory reported confirmation of the fragment at 0.01 ng\/mL in equine urine and 0.02 ng\/mL in equine plasma, together with its metabolites, after a single administration to horses. Those limits come from horse samples. No published study has set out how long TB-500 remains detectable in human urine, so the accurate statement is that it is detectable and the window is not established.\u003c\/p\u003e\n\u003ch2\u003eStorage, stability and handling\u003c\/h2\u003e\n\u003cp\u003eNo stability study of TB-500 capsules has been published, so the expiry or best-before date printed by the manufacturer, if present, is the limit to work to. General peptide chemistry still identifies the risks. Moisture allows peptide bonds to hydrolyse and makes powder clump and capsule shells soften. Heat accelerates every degradation reaction, and light adds to it. Full thymosin beta-4 also contains a methionine residue, which oxidises readily, whereas the Ac-LKKTETQ fragment has none.\u003c\/p\u003e\n\u003cp\u003eKeep the tub closed somewhere cool and dry, away from direct light, radiators and damp rooms. If it is refrigerated, let it reach room temperature before opening so condensation does not form inside, and leave any desiccant sachet in the tub. Write the opening date next to the batch number. Handle the capsules as a laboratory reagent: gloves for opened capsules or loose powder, well away from food and drink, and out of reach of children and animals. Dispose of waste as chemical waste, not in household bins or drains. Keep capsules in their original container so they stay linked to the lot number and any certificate.\u003c\/p\u003e\n\u003ch2\u003eGlossary\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThymosin beta-4\u003c\/strong\u003e: a 43-amino-acid protein found inside most human cells that binds actin; TB-500 products are based on it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAc-LKKTETQ\u003c\/strong\u003e: the seven-residue fragment of thymosin beta-4 (positions 17 to 23), with an acetyl group added, that anti-doping laboratories identified in TB-500 products.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActin\u003c\/strong\u003e: the protein that forms filaments inside cells and drives cell shape and movement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eG-actin\u003c\/strong\u003e: single, unpolymerised actin units; thymosin beta-4 holds a reserve of these.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcetylation\u003c\/strong\u003e: capping the first amino acid of a chain with an acetyl group (the \"Ac\" in Ac-LKKTETQ), adding 42 mass units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLC-MS\/MS\u003c\/strong\u003e: liquid chromatography linked to tandem mass spectrometry, which separates, weighs and fragments each molecule for identification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003em\/z\u003c\/strong\u003e: mass-to-charge ratio, the value a mass spectrometer reports for each ion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrict liability\u003c\/strong\u003e: under the World Anti-Doping Code, a positive sample is a violation whether or not the athlete knew what the product contained.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout Yakka Strength TB-500 Peptide Capsules\u003c\/h2\u003e\n\u003cp\u003eYakka Strength prints its two peptide pots in purple on its black label; this is the TB500 one. The front shows the compound name, capsule count and research-only wording. The side facts panel reads TB500, 250 mcg per capsule, sixty capsules per container, \"Made in the UK\", so 15 mg per pot as labelled; the back panel carries the Yakka Strength Ltd distributor line. The brand's product page calls the contents a synthetic peptide and no more: it does not say whether the pot holds the acetylated 17-23 fragment that laboratories have found in products sold as TB-500 or full-length thymosin beta-4, so the labelled figure cannot yet be tied to a specific molecule.\u003c\/p\u003e\n\u003cp\u003eYakka Strength Ltd (company 13284431, registered since 2021 in County Durham) is chiefly a gym equipment and sports nutrition retailer. TB500 appears in four of its research items: this pot, the \u003ca href=\"\/en-ro\/products\/yakka-strength-yakka-strength-wolverine-stack-bpc157-tb500-capsule-peptide-bundle\"\u003eWolverine Stack\u003c\/a\u003e (this pot with the BPC157 pot, two pots of 60), the \u003ca href=\"\/en-ro\/products\/yakka-strength-yakka-strength-mk677-tb500-capsule-bundle\"\u003eMK677 and TB500 bundle\u003c\/a\u003e and the \u003ca href=\"\/en-ro\/products\/yakka-strength-yakka-strength-mk677-bpc157-tb500-capsule-bundle\"\u003eMK677, BPC157 and TB500 bundle\u003c\/a\u003e. See the \u003ca href=\"\/en-ro\/collections\/brand-yakka-strength\"\u003eYakka Strength brand page\u003c\/a\u003e for the whole range. Nothing on the brand's site mentions testing, and no manufacturer is named, so the route to checking a pot is through us: read the lot number off the container (the label design carries none), ask which document Yakka Strength has sent for that lot, and look first at the identity line, then at content per capsule against the 250 mcg declared.\u003c\/p\u003e\n\u003cp\u003eTB-500 is a research-market name for synthetic peptides derived from thymosin beta-4, an endogenous 43-residue protein; the whole protein has reached early clinical trials, the fragment has not. No form of it holds a UK medicines licence or supplement authorisation, and WADA's section S2 covers thymosin beta-4 and its derivatives, naming TB-500. On stated figures, \u003ca href=\"\/en-ro\/collections\/brand-thoroughbred-labs\"\u003eThoroughbred Labs\u003c\/a\u003e labels its TB-500 capsules at 300 mcg in 60 (18 mg per tub); Free Muscle's own TB-500 is 60 capsules with each batch assayed at Janoshik Analytical, and we quote no strength for it here. The \u003ca href=\"\/en-ro\/collections\/tb-500\"\u003eTB-500 collection\u003c\/a\u003e lists them together without ranking.\u003c\/p\u003e\n\u003ch2\u003eRelated\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/collections\/tb-500\"\u003eAll brands of TB-500 we stock, compared\u003c\/a\u003e, including \u003ca href=\"\/en-ro\/products\/thoroughbred-labs-tb500-peptide-capsule-ndash-thoroughbred-labs\"\u003eThoroughbred Labs TB-500 capsules\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ro\/collections\/brand-yakka-strength\"\u003eAll Yakka Strength products\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-ro\/collections\/peptides\"\u003eResearch peptides\u003c\/a\u003e and \u003ca href=\"\/en-ro\/products\/yakka-strength-yakka-strength-bpc157-peptide-capsules\"\u003eYakka Strength BPC-157 capsules\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\u003eGoldstein AL, et al. Thymosin beta4: a multi-functional regenerative peptide. Basic properties and clinical applications. Expert Opin Biol Ther. 2012;12(1):37-51. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/22074294\/\" rel=\"noopener\"\u003ePMID: 22074294\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eRuff D, et al. A randomized, placebo-controlled, single and multiple dose study of intravenous thymosin beta4 in healthy volunteers. Ann N Y Acad Sci. 2010;1194:223-9. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/20536472\/\" rel=\"noopener\"\u003ePMID: 20536472\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eEsposito S, et al. Synthesis and characterization of the N-terminal acetylated 17-23 fragment of thymosin beta 4 identified in TB-500, a product suspected to possess doping potential. Drug Test Anal. 2012;4(9):733-8. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/22962027\/\" rel=\"noopener\"\u003ePMID: 22962027\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eHo EN, et al. Doping control analysis of TB-500, a synthetic version of an active region of thymosin beta4, in equine urine and plasma by liquid chromatography-mass spectrometry. J Chromatogr A. 2012;1265:57-69. \u003ca href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/23084823\/\" rel=\"noopener\"\u003ePMID: 23084823\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yakka Strength","offers":[{"title":"Default Title","offer_id":48468982956258,"sku":null,"price":46.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/3499\/5426\/files\/yakka-strength-tb500-peptide-capsules-pack-shot-white.jpg?v=1791052915"}],"url":"https:\/\/freemuscle.co.uk\/en-ro\/collections\/tb-500.oembed","provider":"Free Muscle","version":"1.0","type":"link"}