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 GHK Cu hair loss prevention GHK CU Copper Peptide, Hair & Scalp Serum, 2 oz (60 ml) Neurogan + Health GHK CU Copper Peptide Hair and Scalp Serum PrettyStick GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B