What a peptide certificate of analysis tells you about quality
HPLC purity, mass-spectrometry confirmation, counterion and water content. A primer on the paperwork behind a trustworthy preparation.
Heredity Editorial · May 25, 2026 · 6 min
A certificate of analysis, or COA, is the document that turns a claim into evidence. For anything dispensed under prescription, it is part of how quality is demonstrated rather than asserted.
Purity and identity
Two figures anchor most COAs: a purity percentage, usually measured by high-performance liquid chromatography (HPLC), and an identity confirmation by mass spectrometry, which verifies the molecule is what the label says. Without both, purity alone is meaningless.
The details that get skipped
Water content and counterion (often acetate or trifluoroacetate) affect how much active compound is actually present. Sterility and endotoxin testing matter for anything prepared for injection. A serious preparation accounts for all of these.
Why fulfillment belongs with a pharmacy
At Heredity, members do not chase paperwork from anonymous suppliers. Eligible selections are compounded and dispensed by licensed U.S. pharmacy partners, where quality testing is a condition of operating, not a marketing screenshot.
How Heredity approaches this
Heredity is application-only and clinically supervised. Membership is reviewed, not sold, and any protocol is designed and overseen by a licensed clinician, then compounded by a licensed U.S. pharmacy partner.
Nothing in this article is medical advice, nor a claim that any peptide diagnoses, treats, cures, or prevents any condition. Suitability is assessed individually. If a topic here is relevant to you, the right next step is a conversation, not a purchase.
Educational information only — not medical advice. Nothing here is intended to diagnose, treat, cure, or prevent any condition. Membership is reviewed individually; any protocol is overseen by a licensed clinician and dispensed by a licensed U.S. pharmacy partner. See our medical disclaimer.
