How to spot a fake or recycled COA

A certificate of analysis (COA) is the most persuasive document a peptide shop can show you. It is also the easiest one to misuse. A clean chromatogram with a big purity number looks just as reassuring whether it was run last month on the batch you are buying or two years ago on somebody else’s product.

This guide is about the paperwork, not the chemistry. You don’t need a lab to catch most problems — you need ten minutes and a habit of asking one question: does this document belong to the vial I will receive?

First: know what a COA should contain

A useful COA is specific. At minimum, look for:

• The product name exactly as it appears on the label.
• A batch or lot number — the single most important field.
• The testing laboratory’s name and, ideally, a way to contact or verify it.
• The test date.
• The method (for example HPLC for purity, mass spectrometry for identity) and the result.

If any of these are missing, the document is a marketing image, not a certificate.

Check 1: does the batch number match the label?

When your order arrives, compare the lot number on the vial or box with the one on the COA. A mismatch doesn’t automatically mean fraud — shops restock, and the COA on a product page may lag behind — but it means the report you saw tells you nothing about the vial you hold. Ask the shop for the COA of your batch.

Check 2: one COA for every product?

Open the COAs for three different products on the same shop. If they share the same layout, the same date, the same chromatogram shape and only the product name changes, someone has been busy with an image editor. Real reports for different compounds look different.

Check 3: is the date plausible?

A report dated years before the product was listed, or a single report that has stayed on a product page through many restocks, is a recycled COA. It may have been genuine once. It no longer describes what is being sold.

Check 4: can the lab be verified?

Some laboratories issue reports with a unique key or code that you can check in a public database on the lab’s own website. If a COA carries such a key, use it — and check that the result in the database matches the PDF exactly, including the batch and the date. If the lab is named but can’t be found anywhere, treat the document with suspicion.

Check 5: look for edit marks

Zoom in. Fonts that change mid-line, numbers that sit slightly off the baseline, a purity figure in a different weight from the rest of the table, blurry patches around key values — these are signs of a document that was altered after it was issued.

Check 6: does the purity claim match the report?

If a shop advertises one purity figure and the attached report shows another, ask which one is right. A claim on a product page is a claim; the report is the evidence.

Check 7: what happens when you ask?

The most revealing test is simple: email support and ask for the COA for the batch you are about to order. A confident shop answers with a document that has your batch number on it. Vague answers, a generic PDF or silence tell you as much as any chromatogram.

Where our top three stand

We hold every shop on PurityWatch to the same standard, top three included — and we say plainly what we found.

• Nexo Research has not published lab reports yet. Ask support for the COA of your batch before you order.
• Europa-Peptide: we found no public lab reports on europa-peptide.de. The same advice applies.
• Peptid24 states a purity of at least 98% for its lyophilized products, but we found no public lab reports either. Ask for the batch COA — and check that it supports the stated figure.

That’s why the “Public COAs” row on our facts sheets says “not published” for all three. When any of them publishes reports, we update the page.

The short version

1. A COA must name the product, the batch, the lab, the date and the method.
2. The batch on the COA must match the batch on your vial.
3. Identical-looking reports across products are a red flag.
4. Verify the report with the lab if it offers a lookup.
5. If a shop can’t send the COA for your batch, think twice.

None of this is about how to use any product — PurityWatch covers research-use shops and never gives dosing or medical advice. It’s about making sure the paper you’re shown is worth the trust you’re asked to give it.