A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend NAD+ and GHK Cu aren't interchangeable! They're complementary One restores what's happening beneath the surface: cellular energy, mental clarity, vitality that lasts beyond a caffeine rush. The other rebuilds what you see: NAD+ vs GHK Cu: Why Energy and Repair Are Two Completely Different Systems GHK Cu Revival Clinic GHK Cu Peptide Benefits (And a Few Risks) Explained