We sell peptides in capsule form. We also think you deserve a straight answer about what that means, so here it is — including the part that does not help us sell anything.
The short version
Most peptides taken by mouth are broken down before they reach your bloodstream. That is not a marketing position, it is basic digestive biochemistry, and it is the reason essentially every clinical trial on this class of compound uses injection rather than a pill.
Why peptides struggle orally
A peptide is a short chain of amino acids. Your digestive system exists to break protein chains into their component amino acids so they can be absorbed. It is extremely good at this. Three things work against an orally administered peptide:
- Stomach acid. Low pH begins breaking the chain apart before it leaves the stomach.
- Digestive enzymes. Pepsin, trypsin and chymotrypsin cleave peptide bonds specifically. That is their job.
- The intestinal wall. Even a fragment that survives digestion still has to cross the gut lining, and larger molecules cross it poorly.
The result is that oral bioavailability for most peptides is measured in low single-digit percentages, and often below one percent.
But some oral peptides exist as real medicines
They do, and it is worth understanding why, because it shows what it actually takes.
Oral semaglutide is the well-known example. It works because it is formulated with an absorption enhancer (SNAC) that transiently raises local pH and helps the molecule cross the stomach lining. Even with that engineering, its bioavailability is around one percent, and the oral dose is many times larger than the injected dose to compensate.
That is the standard. A peptide in a capsule without that formulation science is not the same product.
What this means for what we sell
We are not going to tell you our capsules reproduce what injection achieves in a trial, because we have not run the study that would let us say it. What we can tell you is narrower and verifiable:
- The identity and purity of every batch is assayed by Janoshik Analytical, a laboratory we neither own nor control.
- The batch number is printed on the pack, and we will send you that batch's Certificate of Analysis on request, whether or not you have bought anything.
- These products are supplied for laboratory research use only. They are not authorised as medicines or food supplements in the UK or EU.
What is in the capsule, we can evidence. What it does once you swallow it, we cannot.
Questions worth asking any peptide seller
- Can I see the Certificate of Analysis for the specific batch you would ship me? Not a generic PDF, not one from two years ago — that batch.
- What is the oral bioavailability of this compound? If the answer is a confident percentage with no citation, treat it the way you would any other unsourced number.
- Was the research you are citing done with injection or with capsules? Almost always injection. That matters.
- Is there any human clinical data at all? For most compounds in this category, honestly, no.
The uncomfortable conclusion
If you want the effect described in a clinical trial, the route used in that trial is not incidental to the result. A capsule is more convenient, and convenience is a real benefit — but it is not the same thing as equivalence, and anyone selling it as equivalence is telling you something they cannot support.
We would rather lose a sale to that sentence than earn one without it.
Research compounds sold by Free Muscle are supplied for laboratory and research use only. They are not medicines, have not been evaluated by the MHRA, EMA or FDA, and are not for human consumption. Nothing on this page is medical advice. If you are considering any compound for a health purpose, speak to a qualified clinician.