Alternatives to ExtolX in the UK: sellers you can actually verify

ExtolX (extolx.co.uk) is on The Peptide Watch's watch list. What its certificate shows, and why it cannot be verified in its own name, is set out in the ExtolX audit. This page answers the other half of the question: which UK sellers do publish a certificate you can check yourself before you buy. The Peptide Watch takes no vendor money and links to no seller's shop.

Verified alternatives to ExtolX

Unlike ExtolX, each seller below has been checked to publish a certificate you can verify yourself on an independent laboratory's website. A selection of six is shown here; the full ranked list of 38 is linked underneath.

1. Claripep claripep.co.uk · own-name Janoshik COA Jul 2026
2. Novex Labs novexlabs.co.uk · own-name Janoshik COA Jul 2026
3. Velox Peptides veloxpeps.com · own-name Janoshik COA Jun 2026
4. Peptide Biosciences peptide-biosciences.com · own-name Janoshik COA Jun 2026
5. Biohacklondon biohacklondon.com · own-name Janoshik COA Jun 2026
6. Velonix Labs velonixlabs.co.uk · own-name Janoshik COA Jun 2026

Full ranked list: the 38 independently-tested UK vendors. Read the complete ExtolX audit, or check any shop with the free COA Checker.