Certificate of analysis checklist for peptide products
A practical checklist for checking whether a certificate is relevant, traceable and understandable.
Trace the certificate to the package
The product name, batch or lot identifier, sample date and tested presentation should correspond to the item being offered. A report for another batch or an unspecified sample has limited value.
Check who collected the sample and whether the laboratory is independent from the seller. Seller-submitted testing and regulator sampling answer different questions.
Identity, purity and quantity are different results
An identity result asks whether the expected substance was detected. Purity describes the measured proportion under a stated method. Quantity or assay asks how much is present. One result should not be presented as proof of all three.
Methods, acceptance criteria, uncertainty and the full result context matter. A single headline percentage is not enough to assess safety or suitability.
Know what was not tested
A certificate should not imply coverage for sterility, endotoxins, residual solvents, microbiological contamination, particulate matter or container integrity unless those tests and results are actually included.
Editorial and source policy
This entry is marked as draft. Before public launch, product-specific claims should be checked against primary regulatory documents, official product information and peer-reviewed research, with source links and a dated medical/editorial review.