How to read a peptide certificate of analysis (COA)

How to read a peptide COA. The certificate of analysis (COA) is the single most important document in research-peptide sourcing — it is the difference between verified purity and an unverified marketing claim. This guide explains how to read one line by line: the lab, the HPLC purity figure, the batch identifier, and how to check it independently. Learn to read a COA and you can evaluate any supplier, not just this one.

What a COA is

A certificate of analysis is the laboratory report that documents the identity and purity of a specific batch of a compound. For research peptides the key COA is the HPLC purity report from an independent lab — it states which batch was tested, what purity was measured, and by whom. Everything Elite AU Peptides lists is supplied research-use-only with an independent COA on file; the lab-reports library collects them all.

The four things a COA must show

Read a certificate for four things. First, the independent testing lab — Elite AU Peptides uses Janoshik Analytical. Second, the measured HPLC purity figure for the specific batch — a real percentage, not a rounded “99%+” slogan. Third, a batch or report identifier that ties the certificate to the exact vial. Fourth, a test date. A certificate missing any of these is not doing its job.

Why HPLC is the figure that matters

High-performance liquid chromatography (HPLC) is the standard analytical method for measuring peptide purity — it separates the target peptide from impurities and quantifies how much of the sample is the intended compound. An HPLC purity figure from an independent lab is the meaningful signal; a purity claim with no HPLC report behind it is just a number. This is why every Elite AU Peptides batch is independently HPLC-tested before it is listed, and why the measured figure — not a marketing round-number — is what appears on the certificate.

How to verify a COA is genuine

The strongest COA is one you can independently verify. Check that the certificate names a real independent lab, carries a batch/report number, and that the number is verifiable with that lab directly. Elite AU Peptides publishes each certificate with a report number verifiable at janoshik.com and links it to the matching product page. If a “certificate” has no verifiable report number or independent lab, treat it as a marketing image, not proof — this is the core skill the research-peptides pillar points back to.

Blends report content, not a single purity

A multi-peptide blend can’t be summarised by a single purity percentage. A research-honest certificate for a blend reports the measured content of each component separately — the correct way to certify a stack. When you read a blend’s COA, expect per-component content rather than one combined figure; anything else is oversimplifying the chemistry. See a real example on the GHK-Cu product page and across the lab-reports library.

Why this is the brand’s whole promise

The COA is the proof behind “research use only”. Elite AU Peptides supplies research-grade compounds for in-vitro and laboratory research use only — not for human or animal consumption, not therapeutic goods, not TGA-approved — and the certificate is what lets a researcher trust the identity and purity of the material. The compliance context that sourcing sits inside is covered in the legality guide.