GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes GHK Cu 50mg Copper Peptide Research Spartan Peptides Influence of Coordination Geometry upon Copper(II I) Redox Potentials. Physical Parameters for Twelve Copper Tripodal Ligand Complexes Inorganic Chemistry 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 Computational study of copper binding to DAHK peptide ScienceDirect