AHK Cu Research Guide Canada Copper Peptide for Hair Growth AHK Cu Hair Elixir 4800mg 99% Hair Growth & Scalp Care Neurogan Health GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Copper Peptides for Hair Growth AHK Cu Copper peptides (GHK Cu) have been studied for decades for their role in tissue repair and that same biology applies to hair. Research shows GHK Cu may help strengthen existing hair follicles, reduce