Not all hair serums are built the same This one is powered by a dual copper peptide system GHK Cu + AHK Cu Designed to support: stronger feeling hair improved elasticity 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 Buy AHK Cu AHK Cu: what kind of peptide it is, properties, features, and use in cosmetics GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective?