GHK Cu GHK cu Powder CAS 49557 75 7 Suppliers, Manufacturers, Factory Wholesale Price Bloom Tech GHK Cu Side Effects, Complications, and Risk Profile 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 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper