COA Red Flags: 8 Signs a Peptide Certificate Can’t Be Trusted
A Certificate of Analysis is the single most important document a peptide supplier can give you, which is exactly why it is the document most often faked. Certificates get reused across products, edited after the fact or borrowed from other companies. These are the warning signs to look for before you trust one.
1. No lot number, or a lot number that doesn’t match
A COA describes one batch. If the certificate has no lot number, or the lot on the certificate differs from the one on your vial or product page, it is not evidence about what you are buying.
2. No test date, or a very old one
Every certificate should show when the sample was tested. An undated certificate, or one tested years before the product’s current lot, suggests the same document is being used for every batch.
3. The laboratory is missing, cropped or unverifiable
The issuing lab should be named, with its address and accreditation. Blurred logos, cropped headers or a lab name you cannot find anywhere are serious warning signs. Look for ISO/IEC 17025, the accreditation standard for testing laboratories.
4. The same chromatogram appears on different products
Each compound gives its own pattern of peaks and retention times. If two “different” peptides from one seller have identical-looking chromatograms, with the same peak shapes, the same small impurity peaks and the same retention time, one image is probably being reused.
5. The numbers don’t add up
Check that the stated purity matches the peak table. The main-peak area divided by the total area should give the reported percentage. Watch for a perfect “100%”, purity values repeated to the decimal across many lots, or molecular weights that differ from the compound’s known value.
6. Only purity is reported
A certificate with a single purity number shows that one compound dominates the sample, not that it is the right compound. Credible certificates add mass spectrometry for identity, and ideally endotoxin and heavy metals. See what 99% HPLC purity really means.
7. Signs of editing
Mismatched fonts, misaligned text, a different resolution in one area of the image, or a PDF that has been flattened into a photo can all mean values were changed. Original lab reports are usually generated straight from the lab’s system and look consistent throughout.
8. The supplier won’t share it before you buy
If the certificate is only available after purchase, “on request” with no follow-through, or only for some products, you cannot use it to decide. A supplier confident in its testing makes results easy to find.
A credible COA has:
- Compound name and lot number matching your vial
- Test date and the named, accredited laboratory
- HPLC chromatogram with a peak table that supports the stated purity
- Mass-spectrometry identity result
- Endotoxin and heavy-metal results for sensitive work
How to double-check
If a certificate looks questionable, contact the laboratory named on it and ask whether it issued a report for that sample number. Most accredited labs will confirm whether a report is genuine. You can also ask the supplier for the original PDF rather than an image.
Our certificates
Every lot we sell is tested by Bioviridian Labs (ISO/IEC 17025, Texas) for HPLC purity, mass-spectrometry identity, endotoxin and heavy metals. Each product page shows the current lot, and our COA Library lists every lot with its results. For a broader checklist, read how to tell if a research peptide is real.
For laboratory research use only. Not for human or veterinary use.