AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan 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 Hair Growth Serum Intense with Copper Peptide GHK Cu GHK Cu GHK Cu Copper Tripeptide Hair Serum: DHT Blocker, Fuller Looking Hair Soon as 7 9 Weeks 1oz Etsy GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml)