2026-05-14

COA Report Card: Is your vendor transparent?

Every peptide vendor says their products are pure. Few prove it.

A Certificate of Analysis — COA — is the only document that verifies what's inside the vial. It's not marketing. It's not a promise. It's a lab report with measurable data: HPLC purity, mass spectrometry molecular weight confirmation, endotoxin levels, and the name of the lab that ran the tests.

The problem: not all COAs are equal.

A manufacturer COA is not independent verification. It's the vendor grading themselves. A third-party lab COA — Janoshik Analytical, ChemClarity, Colmaric Analyticals — is real verification. The difference matters when you're injecting something.

What a legitimate COA should show: batch number matching your vial, HPLC chromatogram showing the purity peak, mass spectrometry data confirming molecular weight, endotoxin test results below 10 EU/mg, name and contact information of the lab that performed the tests, and date of analysis.

What you should question: purity percentages without a chromatogram ("99% pure" with no evidence), generic COAs that don't match the specific batch you received, testing performed only by the manufacturer, and any vendor that refuses to provide batch-specific documentation on request.

A test we ran: we looked up published COAs across five popular research peptide vendors. Three published batch-specific documentation from independent labs. Two displayed generic documents with no batch traceability — meaning the COA on their website might have no relation to the product in your refrigerator.

Purity matters more than you think. The difference between 92% and 99% purity is not 7% — it's 8% more dosing required for the same effect, plus unknown contaminants entering your body. For research protocols requiring precise dose-response curves, that variance invalidates results.

We don't sell peptides. We have no relationship with any vendor. We receive no commissions. That allows us to tell you what vendors can't: most COAs you see online aren't worth the PDF they're printed on.

Demand batch-specific documentation from independent labs. If your vendor won't provide it, ask yourself why.