COPPER TRIPEPTIDE GHK AGE REGRESSION.COM Aqueous Solution Equilibria and Spectral Features of Copper Complexes with Tripeptides Containing Glycine or Sarcosine and Leucine or Phenylalanine 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: Uncover Its Full Potential Copper Peptide (GHK Cu) Supplier Cosmetic Ingredient for Formulators Creative Peptides