What Is a Certificate of Analysis (COA)?

A Certificate of Analysis, commonly called a COA, is a document used to report analytical results for a particular batch or lot of a research material. For researchers, a COA can be a useful starting point for reviewing what was tested, which methods were used, and whether the reported results correspond to the lot being considered.

Why a COA matters

A product page can describe a material, but a batch-specific COA provides analytical information tied to a particular lot. That distinction matters when a researcher wants to review documentation rather than rely only on a general product description.

What you may find on a COA

• Compound or material identity
• Lot or batch number
• Testing date
• Analytical method and laboratory information
• Purity or assay results
• Identity testing such as mass spectrometry
• Additional quality-control results, when applicable

COA versus a product description

A product description explains what a supplier says a product is. A COA documents analytical results for a specific batch. They serve different purposes and should not be treated as interchangeable.

How to use a COA responsibly

Start by matching the lot number on the certificate with the material or batch you are evaluating. Then review the reported methods, results, laboratory information, and testing date. A COA is one piece of research documentation; it does not by itself establish suitability for every laboratory application.

Review the current COA library

True Sciences maintains a public COA library with batch-specific analytical documentation. Review the True Sciences COA Library →

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