How to Read a COA

Reviewed for accuracy by the Gorilla Research Labs research team · 2026-07-04

GUIDE How to Read a COA A Certificate of Analysis (COA) summarizes the methods and results reported for the material and lot identified on that document. COA availability is product-specific. This guide explains what to check—and what a document does not establish.

What a COA Is

A COA is a batch-specific report. Its evidentiary value depends on lot linkage, the issuing laboratory, methods, specifications, results, units, and dates. It supports only the attributes actually measured and reported.

Key Fields on the Document

Batch / Lot Number The unique identifier for the production run. Match this to the batch number printed on your product, and cross-reference it against our COA database to confirm the document belongs to your material. Compound Identity The stated material identity. Mass-spectrometry evidence can support identity when the expected mass, method, tolerances, and sample linkage are documented; it does not rule out every possible contaminant. Purity The reported chromatographic purity under the stated method conditions. Do not confuse area-percent purity with peptide content, identity, sterility, endotoxin, or total assay. Analytical Methods The techniques used to generate the results. Look for enough method information to understand what was measured and whether the procedure is suitable for the stated purpose. Issuing Laboratory The organization that issued the result. If independence, accreditation, or a particular scope matters, verify those facts from the named laboratory or accreditation record. Chromatogram / Spectra The visual output from HPLC and LC-MS analysis. A clean, well-resolved peak profile supports the reported identity and purity values.

How to Verify Your COA

• Locate the batch number printed on your product. • Cross-reference that batch number against our COA database. • Confirm the compound name, batch number, and issuing laboratory on the COA match your order. • Check that the reported purity meets the product’s stated specification. If any detail does not match, contact us before using the material. A COA documents identity and purity for research purposes. It does not authorize or imply any use beyond laboratory and scientific research. All products sold by Gorilla Research Labs are intended strictly for laboratory and scientific research purposes only. Not for human consumption.