GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution Copper Tripeptide For Thinning Hair Regrow Serum Essence Oil DHT Blo Collagen Tripeptides GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml) Small molecules. Powerful results. Experience Peptide Power with Hairgenetix's advanced Copper Peptide Hair Growth Serum, formulated with 10% GHK Cu and 5% AHK Cu to support hair health at the follicle level. Helps GHK CU 50mg OP Labs (Formerly Oxford Peptides)