Is Polygonpeptides legit? An independent review
Polygonpeptides is on the watch list: its certificate can't be verified in its own name, one of 483 of 524 UK sellers that fail this check.
- Certificate
- none found in its own name
- Official website
- polygonpeptides.co.uk
- Buyer reports
- Coming soon, visible from 1 November 2026 · tell us about your order
Checked daily against the seller's site, the laboratory's site and the public record. If this seller publishes new evidence, tell us and it is re-checked. Method · data · correction
What we found
Polygonpeptides leans on the Janoshik name in its copy, sometimes a paragraph copy-pasted word-for-word across several 'different' shops, but provides no actual certificate, task number or verification link. It is renting Janoshik's reputation without ever having used them in a way you can check. Aggravating: barely a functioning shop.
New As of 13 October 2026 you can leave feedback on your order. Reports are being collected now and will be shown on this page from 1 November 2026, so every seller has the same time to gather them. Written notes appear only after we have read them.
Tap one to start, about 30 seconds.
Questions people ask about Polygonpeptides
Is Polygonpeptides legit?
Polygonpeptides (polygonpeptides.co.uk) is on The Peptide Watch's watch list. It does not publish a certificate of analysis that can be independently verified in its own name, so its quality claims rest on trust rather than checkable evidence. That is not proof of a scam; it means the evidence does not check out.
Does Polygonpeptides publish a real, verifiable Certificate of Analysis?
Not one that can be independently verified in its own name. They name-drop 'Janoshik' in marketing copy (often a copy-pasted paragraph) but there's no actual certificate, task number or verify link anywhere, the claim is unbacked.
How do I check Polygonpeptides's certificate myself?
Find the certificate on polygonpeptides.co.uk and read four things: an independent laboratory is named; the client field names Polygonpeptides, not a supplier; the compound line names the peptide you are buying, not only a batch code; and the report opens on the laboratory's own website from its task number and key (verify.janoshik.com for Janoshik). Then compare the batch number on the report with the one on your vial. The free COA Checker on this site runs the first three checks on a photo of the certificate.