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 COPPER TRIPEPTIDE GHK AGE REGRESSION.COM What is GHK Cu Collagen and Elastin Support Neurogan Health GHK Cu Copper Peptide: The Complete Research Guide CertaPeptides Aqueous Solution Equilibria and Spectral Features of Copper Complexes with Tripeptides Containing Glycine or Sarcosine and Leucine or Phenylalanine