Third-party tested peptide vendors

Third-party testing: questions people ask

Which peptide vendors are third-party tested?

48 active vendors publish batch-specific COAs on their own sites, out of 135 whose COAs we could check. Those with the highest transparency scores, leaving out vendors with red flags or a recent enforcement action: Pure Peptide Labs, Peptidology and Coastal Peptides.

Which labs test research peptides for vendors?

The labs named most often on vendors' COAs are Freedom Diagnostics (17), Janoshik Analytical (9), ILS Laboratories (7) and Kovera Labs (6). A named lab is a start: check that the report's batch number matches your vial.

Is a vendor's COA proof of quality?

No. A COA describes one sample from one batch, and the vendor chooses what to publish. Check that the batch or lot number matches your vial, that the lab is named and independent, and that the report is recent. Some labs let you verify a report on their own site. How to read a COA.

What is a batch-specific COA?

A certificate of analysis tied to a specific production batch or lot, usually showing purity (HPLC) and identity (mass spectrometry). A generic or sample COA isn't tied to what you receive. 73 active vendors in our registry publish only generic or sample COAs.