GHK Cu 50mg vs 100mg: Which Concentration Should You Buy? Good skin starts with the right ingredients. We made the GHK Cu Peptide Serum for people who want real results without the clinical experience. Copper peptides, hyaluronic acid, niacinamide and more, in one GHK CU: 100mg Supernova Peptides Intense Copper Binding GHK Cu 5% + Tetrapeptide 7 5% Cellular Repair S Chebo Clinic GHK Cu Topical Cream Skin Perfection GHK Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz Walmart.com