GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml) GHK CU Copper Tripeptide 1 CocoJojo Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum eBay 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 Absolute GHK cu Stem Cells & Peptide Hair Growth Serum and Shampoo MTS Set Natural Copper Peptide Serum Booster