AHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair Discovery Size (10 mL) Neurogan Health Introduces AHK CU + GHK CU Hair Serum Pro GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? 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