Free tool

Peptide COA checker

Upload a certificate of analysis. We read it twice, check identity, purity, measured amount, endotoxin and the lab against a published rubric, and show what is supported and what is missing.

Compound on the certificate

Form

Injectable / vialOralNasalTopical

Choose the PDF from the lab, or a clear photo of every pagePDF, PNG or JPG, up to 10 MB

Your file and report are private to your account. Up to 10 checks a day.

How the grade is set

Start at A-, then the lowest cap that applies wins. We don't yet confirm certificates with the lab's own records, so nothing scores above A-.

Identity: Mass-spectrometry masses must match the compound (within 0.1%, minimum 1.5 Da). No identity test or a wrong mass is an F.
Purity: HPLC purity printed, ideally detected at 200–230 nm. Below 95% caps at C+; no figure caps at C.
Measured amount: A measured mg per vial, not just the label. Missing caps at C; outside 90–110% of the label caps at B.
Endotoxin: Required for injectables. Missing caps at D.
Laboratory: A named independent lab. None named caps at D; seller-run testing is an F.
Paperwork: Lot number (missing caps at B), test date, and every result inside its own printed limit (any failure is an F).

Before you trust any certificate

The lot on the paper must match the lot on your vial, character for character.
Purity is a share of what the detector saw, not how many milligrams you have.
Bacteriostatic water does not make material sterile or remove endotoxin.

How to read a certificate of analysis →
Purity testing explained →