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How can I get a peptide independently tested (Janoshik and other labs)?

A vendor's COA describes a batch the vendor tested; independent testing of the vial you actually hold is the only thing that speaks to what you have. You send a small amount of your own material to a lab and get back a report on your sample. It is cheaper than most people assume — a purity and identity test typically runs a few tens of dollars, confirmable on each lab's own site — and it is a reasonable baseline for research-use material.

The community relies on a handful of labs that test HPLC purity and mass-spec identity; Janoshik is the common reference, with lab-hosted results and a verification key you paste into its own page to confirm a report is authentic and unaltered, plus a public results database. The step people skip and the one that matters most is verifying: a key or database entry that resolves on the lab's own system is what separates a real COA from a PDF anyone could edit. pepmg does not run the labs or certify any result; it explains how to get an independent answer and confirm it is real.

From: Test your own vial

All help topics · Answers restate pepmg's own pages; the linked section is the authority.

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