Close up of Blue Copper Peptides GHK Cu in Pipette. Beauty serum for anti aging beauty routine Stock Photo Alamy GHK Cu 50mg Copper Peptide Research Spartan Peptides GHK Cu Copper Peptide Serum 1% Black Tie Health BLUE PEPTIDE SPRAY Young Goose 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