Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb RFK Jr plans to boost peptide access amid grey market and FDA safety concerns The Australian 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 Pptido de cobre GHK GHK Cu Tripptido 1