How to read a peptide COA — the practical version

LFLena F.· 2 months ago

Research & educational use only. This content is not medical advice. Consult a qualified healthcare professional before using any peptide compound.

COA literacy is honestly the single most useful skill in this hobby. a good one names the lab, the method (usually mass spec for identity + HPLC for purity %), the date, and the batch. that's the baseline.

what a COA can NOT tell you: that the vial you got matches the batch they tested, or anything about sterility/endotoxin unless they specifically tested it. no batch number and no lab name = treat it as marketing, not data.

3 Replies

PRPat Rivera· Expert· 2 months ago

the batch-matching point is the one most people miss. a COA for a lot you didn't receive is about that lot, not your vial. no batch + no lab = marketing.

Accepted solution

CHChris· Newcomer· 2 months ago

one technical add: HPLC purity is the main peak as a % of UV-absorbing area, which is not the same as mass content or concentration in your specific vial. useful but over-read constantly.

TRTom R· Researcher· 2 months ago

genuinely the most practical thing I've read on here. saved.