2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care 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 Glow from within with GHK Cu Copper Peptide , This powerhouse peptide supports collagen production, skin repair, and hair follicle health, helping improve skin firmness, radiance, and support Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml)