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 Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 GHK Cu Copper Peptide Injections: Advanced Skin Rejuvenation A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu Peptide Therapy Collagen & Skin Renewal