Influence of Coordination Geometry upon Copper(II I) Redox Potentials. Physical Parameters for Twelve Copper Tripodal Ligand Complexes Inorganic Chemistry GHK Cu 50mg Copper Tripeptide Research Compound 99% COPPER TRIPEPTIDE GHK AGE REGRESSION.COM 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 N2 (N Glycyl L histidyl) L lysinato(2 )]copper 89030 95 5 wiki