GHK Cu Peptide (50mg) Advanced Skin Rejuvenation & Healing Support A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? 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 Cu Peptide Before and After: What to Expect for Skin and Hair