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 & Regrowth Treatment Therapy Vitality Health GHK Peptide Hair Growth Clinical Trial (2016) Research Summary Hairgenetix Microneedling for Hair Growth: GHK CU Benefits Revitalize Your Skin: The Benefits of Copper Peptide for Youthful Glow