Advanced GHK Cu Copper Peptide Serum 1% (300mg 30 ml (Pack of 1) Copper Peptide Serum for Hair Regrowth & Thinning Hair Feline Skinscience 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 Intense Copper Binding GHK Cu 5% + Tetrapeptide 7 5% Cellular Repair S Chebo Clinic GHK CU Copper Peptide, Face Serum, 1 oz (30 ml)