GHK Cu Peptide: Benefits for Tissue Repair, Healing, and Recovery Revolution Health & Wellness HealthyDerm Copper Peptides GHK Cu Beef Tallow for Skin: Blue Balm with Methylene Blue, Manuka Honey Unlocking the Power of GHK Copper Bulk Naturals 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