How to read a peptide Certificate of Analysis

What a COA is (and is not)

A Certificate of Analysis (COA) summarizes test results for a specific batch. It helps you verify purity and identity before you buy. It does not replace advice from a qualified professional in your jurisdiction.

Common fields

• Appearance: Visual description of the lyophilized cake or powder.
• Purity (HPLC): Result from a chromatography method — compare to the spec listed for that product.
• Identity: Peptide mapping or mass confirmation, depending on the lab.

Batch traceability

Match the batch ID on your COA to the batch listed on the product page so you know exactly what you’re receiving.