GHK Cu Copper Peptide 0.5% (topical foam) GHK Cu Topical vs Injection Which is the Better Copper Peptide Form? Top 9 GHK Cu Benefits for Skin, Hair, and Anti Aging GHK Cu Isn't Just for Skin: The Anti Aging Peptide That Works From the Inside Out When your hair feels stronger, you do too. The Hairgenetix Extra Strength Copper Peptide Serum, formulated with 10% GHK Cu and 5% AHK Cu, supports hair health at the root helping strengthen follicles,