GHK Cu 99%+ Pure Peptide Amino Club Amino Club 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 structure of the tripeptide GHK Cu. In solution lysine Download Scientific Diagram Copper Peptide (GHK CU) Serum Australian Private Label Skin Care Cellular Cosmetics GHK Cu 100mg Peak Haven