COPPER TRIPEPTIDE GHK AGE REGRESSION.COM Geometry of the (a) four , (b) five , (c) five and (d) six Download Scientific Diagram 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 Peptide: The Complete Research Guide CertaPeptides Is Less More? Influence of the Coordination Geometry of Copper(II) Picolinate Chelate Complexes on Metabolic Stability Inorganic Chemistry