How Do I Know if a Peptide COA Is Real or Fake?

Published August 27, 2026 · Artemis Labs

Research Buyer FAQ › Certificates of Analysis & Verification › How to Spot a Fake COA

A forged Certificate of Analysis almost always breaks in more than one place. Check that the batch number on the document matches the vial, that the raw test pictures are present and unique, that the lab is named and reachable, and that the numbers vary between batches the way real measurements do.

How this page was built. Every check below is one a buyer can run without lab access, using only the document, the vial, and a search engine. The published cases cited under References are transcribed from the papers themselves.

What is a COA supposed to prove in the first place?

A Certificate of Analysis is the lab report for one production batch: what the material is, how pure it is, who tested it, and when. Because it is the main document a buyer ever sees, it is also the main document a dishonest vendor fakes. A PDF is easy to edit, so the point of these checks is not to trust the paper — it is to make the paper prove itself against the vial in your hand and against the outside world.

The stakes are not hypothetical. A 2024 test-purchase study bought vials of the peptide drug semaglutide from unlicensed online sellers and measured them: the labels claimed 99%, and the measured purity of the samples ranged from 7.7% to 14.37% (PMID 39509151). A confident number printed on a label or a certificate is not evidence. The document around the number is where the evidence lives, and forgeries get that document wrong in predictable ways.

Why does the batch number matter most?

Because the batch number — also called the lot number — is the only thread connecting the paper to the vial. A COA describes one production run, not a product line. If the lot printed on the certificate does not match the lot printed on the vial label, the document describes some other material, and it does not matter how good it looks. If the vial carries no lot marking at all, stop there: that vial cannot be matched to any report, so nothing about it is verifiable. A missing lot number means the vendor either never ran a batch-level test or never carried the number through to the label, and neither is acceptable.

Watch for decorative lot numbers too. A lot that reads 001 on every product, or the same lot appearing across months of orders, is a marketing sample dressed up as a batch record.

What does a forged COA usually get wrong?

Forgeries fail on the parts that are hard to fake: the raw pictures, the provenance, and the natural variation of real data. The table below is the ten-minute check, in order.

Check A real COA A forgery’s tell
Lot number Matches the vial label exactly Missing, mismatched, or the same lot on every product
Raw traces Shows the chromatogram and mass spectrum as images A bare number in a table with no pictures behind it
Trace reuse Each compound and batch has its own trace One identical trace recycled across different products
Purity figures Vary between batches and compounds The same figure — 99.2%, say — on every item in the catalog
Lab identity Names the lab, with an address you can find No lab named, or a name with no findable existence
Test date Before your order, and recent Missing, in the future, or years stale
Methods Names the tests run and the conditions Results with no methods listed at all
Expected values Shows observed mass next to the expected mass An observed value with nothing to compare it to

Two of these deserve a closer look. First, the raw traces. An HPLC purity claim comes from a chromatogram — a graph with peaks — and an identity claim comes from a mass spectrum. A real report shows both as pictures. A document that types “99.8%” into a table and shows no graph is asking you to take the number on faith, which is the one thing a certificate exists not to do.

Second, the variation. Real batches differ. Chromatography itself is sensitive enough that different methods run on the same sample resolve different impurities (PMID 39922152), so a catalog where every compound lands on the identical decimal is reporting a template, not a set of measurements.

Can you check the science without a lab?

Some of it, yes — a forger who copies a template rarely fixes the chemistry. The mass spectrum on a COA should state an observed molecular weight next to an expected one, and the expected one is public: look the compound up on PubChem and compare. A document showing an expected mass that belongs to a different compound has been assembled from parts. The same goes for the chromatogram’s labels: a main peak whose retention time is identical, to the second, across unrelated compounds is a reused image. This kind of independent re-checking is exactly how published science polices itself — a 2018 re-examination of a thymosin preparation by high-resolution mass spectrometry found its composition differed from what had been assumed for decades (PMID 30063862). If the professionals re-verify, a buyer can at least cross-reference.

Can you verify a COA with the lab that issued it?

Often, and asking costs one email. If the certificate names an independent lab, that lab exists outside the vendor’s control — it has a website, an address, and staff who answer mail. Ask whether they tested the lot number on your document. A real lab will confirm or deny that a report is theirs; many will flag a document forging their letterhead, because forgery damages them too. If the lab named on the certificate cannot be found, or the vendor refuses to say who did the testing, count the document as unsupported. What independence means, and what it does not, is its own question — covered in what third-party tested actually means.

What does it mean if a COA passes every check?

It means the document is consistent, not that the vial is guaranteed — a COA is evidence, and evidence accumulates rather than concludes. A certificate that names its lab, matches its lot, shows its traces, and varies batch to batch is expensive to fake, and most sellers of bad material do not bother; they fail these checks quickly. Regulators reading vendor paperwork apply the same logic in reverse: the FDA’s warning letters to peptide sellers quote the vendors’ own documents and pages as the record of what they really sell. Read any vendor’s certificate the same way — as their testimony about themselves, checkable line by line.

References

All compounds sold by Artemis Labs are for laboratory research use only. Nothing on this page is medical advice, and no statement has been evaluated by the FDA.