·general
How to read a certificate of analysis (COA)
What the numbers on a peptide COA actually mean — and which ones matter most when you're comparing vendors.
Educational overview · not yet clinician-reviewedLast reviewed Apr 21, 2026
Awaiting medical review
A certificate of analysis is the single most important trust document you'll see from a peptide vendor. Knowing how to read one separates buyers who pay for real content from buyers who pay for reassurance.
The 7 data points worth checking
Pepticker's rubric derives from seven COA categories: peptide identity verification, net content, net purity (typically HPLC), endotoxin testing, sterility testing, heavy metals screening, and batch conformity. Vendors scoring below 5/7 on public COAs get a B- or lower.
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