How is the GHK CU Peptide Used in Skin Rejuvenation and Anti Aging? Concierge MD LA A GHK Cu face serum appears blue because the active ingredient, GHK Cu ( copper peptide), is naturally a blue colored powder, meaning its inherent color transfers to the serum when mixed in; this blue hue PHOTOS: Gil Hanse designed West Palm Golf Park to open to public The Park West Palm is golf's newest hanga Gil Hanse designed course open to the public Golf Courses Golf Digest 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: