GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? AHK Cu Hair Elixir 4800mg 99% Hair Growth & Scalp Care Neurogan Health 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 Copper Peptide Hair Growth Mechanism: What Kinds of Hair Loss Can It Improve? Perfect Medical Amazon.com: Copper Peptide Hair Serum with Copper Tripeptide 1 Dual Peptide Scalp Treatment plus Licorice Root Extract : Beauty & Personal Care Copper Peptide Hair Growth Serum Stimulate & Prevent Loss