A Certificate of Analysis (COA) is the single most useful document a research peptide supplier can give you — and also the easiest one to skim past without actually reading. Here's what each part is actually telling you.Look for third-party verification specifically — an in-house-only purity figure has no independent check behind it.

Mass spectrometry confirmation

Purity alone doesn't confirm identity. Mass spec confirms that the molecule in the vial actually matches the molecular weight of what's on the label — a separate and equally important check.

Lot number matching

This is the detail people skip most often. The lot number on the COA needs to match the lot number printed on your vial. If they don't match, the certificate isn't actually verifying the batch you received — it's verifying a different one.

Test date

A COA from a batch tested a year ago doesn't tell you anything about the batch in front of you today. Recent testing, tied to your specific lot, is what makes a COA meaningful rather than decorative.

What we provide

Every product we sell ships with third-party lab verification. You're welcome to request the current COA for any peptide before you order — we'd rather you check than take our word for it.