BPC-157 is a synthetic 15-amino-acid peptide derived from a protein found in gastric juice, widely studied in preclinical research on tissue repair. It is the single most-sold research peptide in the UK, which also makes it the most faked and the most borrowed-certificate prone. Whatever you pay, the only way to know a vial actually contains BPC-157 at the stated purity is an independent certificate of analysis you can verify, because purity and identity cannot be judged by eye.
Ignore the marketing. The question is simple: does the seller publish a verifiable Janoshik certificate that names the seller itself as the client? If it does, you can confirm an independent lab tested that batch. If it shows an in-house document, a borrowed certificate, or "COA on request", you cannot. Learn the two-minute check in how to verify a Janoshik COA.
Of the 173 active UK research-peptide sellers we audit, only 20 (12%) publish their own verifiable Janoshik certificate. Any of them is where you can actually verify testing, for BPC-157 or any compound. A few: Lab77Peptides · Velonix Labs · Biohacklondon · Peptifyuk · Biohackpeptides · Peptideprime. See the full independently-tested list, or check a specific shop's certificate with the free COA Checker.
We benchmark every vendor on BPC-157 as pounds per milligram; the UK market sits around £3/mg. Among independently-tested sellers, the cheapest we found is £1.61/mg, at Phoenixbiolabs. A low price on a vial you cannot verify is not a saving; each vendor's audit page shows its current price.
An honest note: a verifiable certificate proves a sample of a batch was tested, not that the specific vial you receive matches it, see what this can and can't tell you. The Peptide Watch sells no BPC-157 and links to no shop; this is research-use-only information, not medical or dosing advice.
Other compounds: TB-500 · GHK-Cu · Ipamorelin · CJC-1295 · MOTS-c · Epithalon · Selank · Semax