Buy GHK Cu 50mg, 75mg, 100mg Peptides.GG 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 50mg Copper Peptide Research Spartan Peptides Geometry of the (a) four , (b) five , (c) five and (d) six Download Scientific Diagram GHK Cu Copper Tripeptide 1 Research Reagent Is Less More? Influence of the Coordination Geometry of Copper(II) Picolinate Chelate Complexes on Metabolic Stability Inorganic Chemistry