Testing & Transparency
Common Peptide COA Red Flags
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Short Answer
A trustworthy peptide Certificate of Analysis identifies the specific lot tested, names the testing laboratory, states the analytical method used, and includes a test date. The most common red flags are the absence of one or more of these — especially a purity number presented with no method, lot, lab, or date attached to it.
A Certificate of Analysis is only useful as documentation if it can actually be checked. The checklist below covers the warning signs that a report can’t be verified, is disconnected from the specific product it’s attached to, or is missing the information needed to understand what was actually tested.
- 1
No lot or batch number
A COA that doesn't identify which specific production lot it applies to can't be tied to the material actually in your hands. Testing is performed on discrete batches -- a report with no lot number is, at best, ambiguous about what it covers, and at worst, disconnected from any real batch entirely.
- 2
No named testing laboratory
A legitimate analytical report identifies the laboratory that performed the testing. A report with no lab name (or one that can't be independently verified to exist) removes the one piece of information that would let you check the source.
- 3
No stated analytical method
"99% pure" means very little without knowing what method produced that number. A complete report states the method (e.g. HPLC, LC-MS) used for each result reported -- its absence means there's no way to know what was actually measured.
- 4
No test date
Analytical results are a snapshot of a sample at the time it was tested. A report with no date can't be checked against the product's own timeline or a lab's own records.
- 5
Purity presented without a method, or as the only data point
A single purity percentage, disconnected from any stated method, lot, date, or lab, is not verifiable information -- it's a claim. See our comparison of HPLC and LC-MS for why the method behind a purity number changes what it actually tells you.
- 6
Generic or templated-looking report design across every product
Independent third-party laboratories generally have their own report formats, letterhead, and formatting conventions that stay consistent across their own client base -- not necessarily identical to any other lab's. A single vendor's entire catalog sharing an identical, generic-looking template, with only the product name and a number swapped, is worth a closer look.
- 7
No way to independently verify the lab exists
A real, currently-operating analytical laboratory is generally identifiable and findable independent of the report itself. If a stated lab name returns no independent trace of an operating laboratory, the report's authenticity is unconfirmed.
- 8
The report can't be traced back to the specific product you're viewing
A COA presented in isolation, disconnected from any product page or public database, gives no way to confirm it actually corresponds to the batch offered for sale. A public, lot-indexed COA database -- like the one linked below -- is what lets a specific report be checked against a specific purchase.
What a Complete Report Looks Like
None of the items above require special expertise to check -- they're simply what a complete report includes. Our guide to reading a peptide COA walks through a real report field by field, and our comparison of HPLC vs LC-MS explains why the stated method changes what a purity number actually means.
Related Research
Check a Compound’s Own COA History