Fake or reused peptide COA: red flags and how to check

Why reused certificates happen

A certificate of analysis describes one sample from one lot on one date. Problems start when the same report is shown for later lots, when a "representative" certificate is presented as if it were yours, or when a PDF is edited to change the lot, date or result. Some of this is careless rather than fraudulent, but your file cannot tell the difference without checking.

Supplier wording can make the gap visible. Peptides EU, for example, says that selected independent certificates from Janoshik Analytical are published and that researchers wanting more assurance may submit samples to an accredited independent laboratory of their choice. [3] "Selected" means a published certificate may not cover the lot you receive. Its homepage states purity of 99% or more, independently verified by Janoshik, and testing by HPLC and mass spectrometry. [4] Read that kind of statement as an invitation to ask for your lot's report.

Red flags on the document itself

None of these proves forgery on its own. Each is a reason to ask a specific question before relying on the report.

Check the laboratory, not just the logo

If a report claims ISO/IEC 17025 accreditation, find the accreditation body first. ILAC says its MRA signatories are accreditation bodies peer-evaluated under ISO/IEC 17011 that accredit laboratories to standards such as ISO/IEC 17025, and for many signatories it also links to the accreditation body's online directory of accredited facilities. [1] A2LA, one such body, links a public organization directory from its homepage. [2]

In the directory, confirm three things: the legal name and address match the report, the accreditation is current, and the scope lists the test performed (for example, HPLC purity or mass spectrometry). Accreditation for one test does not cover another. Our separate guide on verifying ISO 17025 accreditation walks through scope documents in detail.

Contact the issuing laboratory

Laboratories can usually confirm whether they issued a report number, even if they will not discuss results with a third party. Keep the request short and factual so it can be answered quickly.

Template: "We received a certificate that names your laboratory. Report number: [number]. Sample or lot reference: [lot]. Test date: [date]. Could you confirm whether your laboratory issued a report with this number and lot reference, and whether the copy attached matches your record? We are not asking you to disclose client information beyond that confirmation." Attach the PDF exactly as received.

Record the date sent, the address used (taken from the laboratory's own website, not from the certificate), and the reply. If the laboratory says it has no record, keep that reply with the file and stop relying on the certificate.

When the lot on the vial does not match the certificate

Photograph the label and the certificate side by side before opening anything further. Write to the supplier with both lot numbers and ask for the report for the lot you received. Keep the material segregated and labelled as unverified until the matching report arrives.

Check the supplier's claim window at the same time. OMNI Peptides, for example, asks for damaged, missing or incorrect order claims within 48 hours of delivery, with photos and a description, and offers replacement, store credit or partial refund. [5] If a lot mismatch might be treated as an incorrect item, raise it inside that window rather than waiting for a reply about the certificate.

Keep the review proportionate

A certificate you cannot verify does not tell you the material is bad. It tells you the document cannot support a decision. If identity or purity matters for your work, the stronger option is your own test at a laboratory you chose and checked, which is what Peptides EU itself suggests. [3] Our guide to commissioning an independent test covers costs and sample amounts.

Store every version you received, with file names that include the date received, so you can show which document you relied on and when. This guide covers laboratory documentation only and gives no guidance on any use of the material.