Aqueous Solution Equilibria and Spectral Features of Copper Complexes with Tripeptides Containing Glycine or Sarcosine and Leucine or Phenylalanine N2 (N Glycyl L histidyl) L lysinato(2 )]copper 89030 95 5 wiki 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 as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link Ghk Cu Copper Peptide: Uncover Its Full Potential COPPER TRIPEPTIDE GHK AGE REGRESSION.COM