What Is a Certificate of Analysis (COA)?

A Certificate of Analysis (COA) is a document that reports the results of laboratory testing on a specific product or batch. It is a standard transparency tool across many industries.

What a COA typically shows

• Identity - confirmation of what the compound is.
• Purity - the percentage of the intended compound, and any detected impurities.
• Test methods - the analytical techniques used, such as HPLC or mass spectrometry.

Why it matters

For anything from supplements to research peptides, a COA lets a buyer verify that what is on the label matches what is in the container. Batch- or lot-specific testing is the most meaningful, since it reflects the exact product in hand.

This article is for general educational purposes only and is not medical, health, or professional advice.