AHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair Discovery Size (10 mL) Copper Peptide Hair Growth Mechanism: What Kinds of Hair Loss Can It Improve? Perfect Medical Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz 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