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How to Read a COA and Evaluate a Peptide Product A Certificate of Analysis (COA) from a compounding pharmacy or research supplier should include, at minimum: identity confirmation (typically HPLC or mass spectrometry), purity percentage (greater than 98% is standard for research-grade peptides), endotoxin testing (LAL assay, critical for injectable preparations), sterility testing, and the specific lot number and test date

"Identification and Analysis of Counterfeit Glutathione Supplements in the Global Market." Journal of Pharmaceutical Sciences, 45(3), 267-281

That said, the best day is always the one you can commit to without interruption

This helps them avoid the intense side effects that happen when you restart a high dose after a break