GHK Cu (Copper) For Sale (50mg) Core Peptides 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper High Purity 99% GHK Cu Copper Peptide Powder CAS 49557 75 7 Supplier Deshangchemical chemechemi chemECHEMI GHK Cu (100mg) 6ml Vial 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