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◇ The Peptide Watch, independent vendor audit

Is Polygonpeptides legit?

polygonpeptides.co.uk · audited 1 July 2026
🚩 On the watch list, its certificate can't be verified in its own name.

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.

Pricing vs the market, benchmarked on BPC-157

BPC-157£3/mg (≈ £30 for a 10 mg vial)
Versus market median (£3.0/mg)1×, competitive

In line with the wider UK market. The Peptide Watch benchmarks every vendor on the same compound, BPC-157, the most common research peptide, as £ per milligram, so prices are directly comparable across all providers.

The audit checklist

CheckResult
Verifiable certificate in its own nameNo
Independent lab namedNone named / unverifiable
Tests its own stockNo evidence
Pricing vs market1× median (competitive)
The bottom line. Polygonpeptides sits on the watch list because it does not publish a certificate that can be verified in its own name. Everything above is observable on its own website and the public record. See the vendors whose certificates are actually their own →
⚠️ Is anything on this page wrong or out of date? Submit a correction request and we'll look into it, vendors welcome too.