AHK Cu Hair Elixir 4800mg 99% Hair Growth & Scalp Care Neurogan Health R 10% Ghk Cu + 5% Ahk Cu Copper Peptide Hair Density Serum Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz Ahk Cu Vs Ghk Cu Comparison Hair Growth Skin Benefits 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, Copper Peptide Hair Growth Serum (GHK Cu & AHK Cu)