How to spot a risky peptide vendor

Not every vendor deserves your trust. These are the red flags that, in our experience verifying the market, separate a serious supplier from one to avoid.

Claims to test, but publishes no CoAs

The number-one signal. Many sites say 'third-party tested' or '99% purity' in marketing, but there isn't a single downloadable certificate. If you can't see the CoA before buying, treat the claim as non-existent.

The lab can't be verified at source

A PDF CoA hosted on the vendor's own store can be faked in minutes. Without a verification link on the lab's domain (for example verify.janoshik.com), there is no guarantee the certificate is real or that it matches your lot.

Hidden owner and no legal entity

A WHOIS behind a privacy service, no registered company, no address or direct contact: if something goes wrong, there is no one to hold responsible. Serious vendors publish their company name and registration number.

Only payment methods with no protection

Zelle, Cash App, Venmo or peer-to-peer transfers offer no buyer protection: if the product doesn't arrive, you lose the money. A card payment or recognised gateway gives you the right to a chargeback.

Resurrected brand or with a history

Names that reappear after a shutdown by regulatory action, or freshly created sites with no trail (no reviews, no archive snapshots): they deserve extra caution. A domain change often erases an inconvenient history.

How to use this comparison

Every CheckPeptides review links to the source evidence for each criterion. If a vendor scores low on 'Accessibility & trust' or 'Transparency', open its review and see exactly why: the source is one click away.