Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference In Vitro and in Vivo Studies of pH Sensitive GHK Cu Incorporated Polyaspartic and Polyacrylic Acid Superabsorbent Polymer ACS Omega A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu Before and After: See Fine Lines and Wrinkles Fade Fast Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum