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 LS5 Copper Peptide Serum LEITIN Skincare Ghk Cu Peptide Serum for Face, Copper Peptides Anti Aging Serum Firming, Wrink eBay GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml)