GHK Cu 99%+ Pure Peptide Amino Club Amino Club GHK Cu Copper Peptide Hair & Scalp Serum 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 Peptide (GHK CU) Serum Australian Private Label Skin Care Cellular Cosmetics Copper peptides GHK Cu, 60 mg solution for preparation SEMAX POLSKA