Copper peptide GHK Cu Tripeptide Proteasome Bortezomib, angle, white png PNGEgg Theoretical study of copper binding to GHK peptide ScienceDirect GHK Cu 50mg Copper Tripeptide Research Compound 99% GHK Cu: The Elegant Copper Peptide for Skin and Scalp Renewal Renew Vitality 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