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 Amazon.com : Mayraki Intense Hair Treatment with Copper Peptide GHK Cu, DHT Blocker for Thicker, Stronger Hair Growth 45 ml 1.52 fl. oz : Beauty & Personal Care GHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair 12 Week Supply (30 mL) 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care