The form of GHK Cu you use may matter more than the peptide itself. Which form of GHK Cu have you personally tried before and what was the FIRST noticeable change you experienced? A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend 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 Cooper Peptide: The Complete Skin & Repair Guide (2026)