Ingredients Hairgenetix GHK Cu, AHK Cu & PDRN Peptides 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 as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link Ingredients Hairgenetix GHK Cu, AHK Cu & PDRN Peptides GHK Cu Peptide The benefits, side effects, and more [2026]