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 peptide GHK Cu Wikipedia GHK Cu LifeStyle Peptides Theoretical study of copper binding to GHK peptide ScienceDirect
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ghk cu chemical structure GHK-Cu: The Elegant Copper Peptide for Skin and Scalp Renewal