AHK CU Peptide Nationwide Peptides by National Science Labs, LLC Copper Peptide Hair Growth Serum 10% GHK Cu & 5% AHK Cu Hairgenetix 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 AHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair