Copper peptide GHK Cu Wikipedia 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 GHK Cu Copper Tripeptide 1 Research Reagent China Copper Peptide(GHK Cu) CAS:89030 95 5 Manufacturers Free Sample Alfa Chemical Coordination geometry of the copper(II) peptide core obtained by QM MM Download Scientific Diagram Ghk Cu Copper Peptide: Uncover Its Full Potential