Your copper peptide product should be this exact blue. If it isn't, you already have your answer. GHK Cu is blue because of coordination chemistry, not dye. The Cu ion at the center Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb how to do a ghk cu peptide before and after TikTok Shop GHK Cu 100mg Peak Haven Molecular structure of the tripeptide GHK Cu. In solution lysine Download Scientific Diagram