COA (Certificate of Analysis)

A document provided by a manufacturer or third-party laboratory that certifies the identity, purity, and composition of a compound. A COA typically includes results from HPLC (purity testing), mass spectrometry (identity confirmation), endotoxin testing, and sterility testing. In peptide research, COAs are considered essential for verifying that a compound meets quality standards. Reputable suppliers provide COAs for each batch produced.