The peptide evidence ladder
Only the GLP-1 medicines and tesamorelin reach the top rung: approved for specific uses after large randomized trials. Most heavily marketed wellness peptides, including BPC-157, KPV and MOTS-c, rest on lab and animal studies. A few, such as Semax, Selank and Epitalon, have small human studies with limited independent replication.
Every peptide in Beiing's guide placed on one scale, from lab and animal studies to FDA-approved medicine, with the reasoning and sources for each.
One scale for every compound: how far the human evidence actually reaches.
Key takeaways
- A compound is placed by the strongest human evidence that exists for any use, not by the use it is marketed for.
- Animal results often fail to carry over to people; a striking mouse study is a reason to run a trial, not a conclusion.
- The ladder is separate from legal status: several low-rung peptides can now be compounded on prescription.
- Placement changes only when new published human evidence appears.
The four rungs
FDA-approved medicine: large randomized trials, reviewed by a regulator for a specific use.
Randomized human trials: controlled trials in people, but no approval for the use being marketed.
Small or early human studies: a few people, short follow-up, limited or no independent replication.
Lab and animal studies: cells and animals only.
Why approval for one use does not cover another
Tesamorelin is approved for a narrow use in HIV-associated lipodystrophy. That puts it on the top rung, but the claim that it helps healthy adults lose fat or slow aging has no comparable trial base. Each compound page shows this gap claim by claim.
What would move a compound up
Published, adequately sized, randomized and blinded trials in people, ideally replicated by independent groups. The first randomized human trial of BPC-157, for acute hamstring strain, began recruiting in February 2026; until results are published, its placement does not change.
How peptide medicines compare overall
Peptides are an established class of medicine. A 2021 review in Nature Reviews Drug Discovery counted more than 80 peptide drugs on the global market and about twice as many in clinical development. The compounds marketed online for wellness are a small, mostly unproven corner of that field.
Frequently asked questions
Why isn't BPC-157 higher if so many people say it works?
Anecdotes cannot separate a real effect from expectation, natural healing and other changes people make at the same time. The ladder counts published human trials, and BPC-157 has none completed.
Does a higher rung mean a peptide is right for me?
No. It describes the published evidence, not your situation. Decisions about any medicine belong with a licensed clinician who knows your history.
Related on Beiing
- Peptide status tracker - The legal side of the same compounds.
- How Beiing rates peptide evidence - The five labels on each compound page.
- How Beiing rates peptide evidence - The five evidence levels used across this section.
- Peptides & Human Biology - The hub for every page in this section.
- Editorial Standards - How our content is researched and reviewed.
Sources
- Muttenthaler M, Alewood PF, et al. Trends in peptide drug discovery. Nature Reviews Drug Discovery, 2021 - Nature Reviews Drug Discovery
- BPC-157 for acute hamstring strain, NCT07437547 - ClinicalTrials.gov, U.S. National Library of Medicine
- Kannengiesser K, et al. Melanocortin-derived tripeptide KPV has anti-inflammatory potential in murine models of inflammatory bowel disease. Inflammatory Bowel Diseases, 2008 - Inflammatory Bowel Diseases (Oxford Academic)
- Drugs@FDA - approved drug products and labels - U.S. Food and Drug Administration
- ClinicalTrials.gov - U.S. National Library of Medicine
- PubMed - National Library of Medicine - NIH
Written by Beiing Editorial Team · Editorially reviewed by Research & Regulatory Review Desk · Published · Last reviewed . Editorial and research review by Beiing writers and researchers. This is not medical or clinical review, and no clinician signs off on our content.
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