If you're not using GHK Cu what are you waiting for?! These photos still blow my mind Same person. Different chapters. GHK Cu (Copper Peptide) is one of the most researched peptides when it GHK Cu Peptide: Turn Back the Clock Naturally Calibrate Hydration 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 Program Calibrate Hydration