Aqueous Solution Equilibria and Spectral Features of Copper Complexes with Tripeptides Containing Glycine or Sarcosine and Leucine or Phenylalanine What is GHK Cu Collagen and Elastin Support Neurogan Health Ghk Cu Copper Peptide: Uncover Its Full Potential 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 Molecular crystal structure of the tripeptide GHK Cu. In solution, Download Scientific Diagram