Regenerative properties of the NL GHK Cu peptide and skin appearance Synthagen PL GHK Cu is a powerful copper peptide that supports collagen production, skin and hair health, and tissue repair. It may help reduce fine lines, improve elasticity, and promote faster healing. Want to learn GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect In Vitro and in Vivo Studies of pH Sensitive GHK Cu Incorporated Polyaspartic and Polyacrylic Acid Superabsorbent Polymer ACS Omega