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 PEPTIDES FOR HAIR GROWTH Ultrastrong 10% GHK Cu Formula with Sonora Supply Co. Copper Peptide Regenerating Serum for Glowing Skin and Hair GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml)