Best Glutathione Supplement Brand in India Glutone GHK Cu Copper Peptide Serum Clinical Anti Aging Skin Repair Beverly Hills Luxury Skincare 30ml 120 ml 4 oz Liposomal Glutathione Setria Antioxidant 60 Capsules (30 Servings) GNC 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