GHK Cu Copper Tripeptide 1 Research Reagent Influence of the counterion on the geometry of Cu(I) and Cu(II) complexes with 1,10 phenanthroline ScienceDirect 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: Evidence, Mechanisms & COA Guide Nootropix inorganic chemistry Why do copper (II) complexes contain so many valence electrons? Chemistry Stack Exchange