GHK Cu 50 mg Copper Peptide Research Grade PRG 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 Copper Tripeptide (GHK Cu) for Advanced Skincare & Haircare Formulatio 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
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ghk-cu copper coordination geometry Molecular structure of the tripeptide GHK-Cu. In solution lysine