Freeze NAD+ (500 mg) NAD+ vs GHK Cu What's the difference & which one is right for you? Although both treatments are powerful, they don't do the same thing. In our carousel, we break down Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes