The Peptide Watch is independent, sells nothing, and takes no payment from any vendor. Here is exactly how every verdict is reached, so you can check our working.
For each of the 263 UK research-peptide domains we have found, we open the vendor's own published certificate of analysis and read two things: which laboratory ran the test, and which company the certificate names as the client. We benchmark pricing on a single common compound, BPC-157, as pounds per milligram, so every seller is compared like-for-like. We record the vendor's Trustpilot score, whether it advertises on Google, and any shared-operator networks visible in public records. We re-scan regularly.
A vendor is independently tested only when it publishes a Janoshik certificate that names the vendor itself as the client and can be verified on Janoshik's own website. Everything else, in-house tests, borrowed supplier certificates, lesser labs, "COA on request" promises, factory QC sheets and fabricated documents, goes on the watch list, with the specific, observable reason shown. Janoshik Analytical is our gold standard because its reports carry a unique, checkable code that cannot be faked. See how to verify a COA and the glossary.
We evaluate the credibility of a seller's evidence, not the product itself. No document, and no website including this one, can prove what is in the specific vial you receive; that would require independently testing the exact unit. Even a genuine certificate only proves a sample was tested once, not that your batch matches it. We reduce uncertainty and filter out fakes, borrowed certificates and undocumented sellers, we do not certify products or eliminate risk.
Every verdict states an observable fact from the vendor's own site, the certificate it published, or the public record. Any vendor can request a correction. The full audit is also an open dataset (CC BY 4.0).