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 Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum eBay Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience