AHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair Discovery Size (10 mL) Pure science. Powerful results. Experience Pure Copper Power with Hairgenetix's Extra Strength Copper Peptide Hair Growth Serum, formulated with 10% GHK Cu and 5% AHK Cu to support hair growth where it matters most AHK Cu Proven Copper Peptide Treatment NEOVA Copper Peptide Hair Growth Treatment GHK cu, AHK cu, Licorice Root Extract, Ginseng Root Extact