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What to look for on a COA (Certificate of Analysis) For raw research-grade GHK-Cu, the COA should specify: purity (ideally above 98% by HPLC), identity confirmation (mass spectrometry or NMR), copper content (stoichiometric copper coordination should be present at approximately 10 to 12% copper by mass in the pure complex), absence of residual solvents, and microbial limits