Certificate of Analysis
The lab document that reports what tests were run on a batch and whether it passed - your core proof of quality.
A Certificate of Analysis (COA) is the document a lab issues summarizing the tests performed on a specific batch, the methods used, the specifications, and the pass/fail results. It's the single most important quality document you'll handle.
A real COA shows the product and lot number, each test with its actual numerical result (not just "PASS"), the method reference, the lab's accreditation details, and a signature. Generic COAs with no numbers, no letterhead, and no report number are red flags - and get rejected by Amazon and scrutinized by the FDA.
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