Every compound supplied is tested by an independent third-party laboratory for identity and purity. Type a compound name to open its certificate.
The library above holds the certificate for each compound. For the certificate matched to the exact lot number printed on your vial, send the number through the contact page and it will be provided.
A Certificate of Analysis is the laboratory report for the material — not a marketing document. A complete one states identity, confirming the substance is what the label says, and purity, typically by HPLC with identity confirmed by mass spectrometry, along with the analytical method and the date of testing.
This matters more than it sounds. The same compound name can cover more than one molecule — different published sequences, different terminal modifications, different counter-ions. The name alone does not pin down the substance; the certificate, the CAS number and the molecular formula do. That is the subject of one name, several sequences, and it is why the compound reference sheets lead with identity data.
On reading one: how to read a peptide COA · mass spectrometry and peptide identity · endotoxin testing and the LAL assay
Certificates by catalogue product · Compound reference sheets · Reconstitution calculator