Copper peptide also known as GHK Cu. Im not saying I look younger than 36, but I think I look pretty good for my age. My skin journey has been rigorous working on treating acne flare ups and 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 GHK CU Before and After Pictures Topical GHK Cu Skin Results, Face Serum Reviews & Photo Results Neurogan Health GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend