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 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: The Park West Palm is golf's newest hanga Gil Hanse designed course open to the public Golf Courses Golf Digest The House Kitchen & Bar + The Cabana West Palm Beach Restaurants GHK Cu Peptide Hormone Replacement Therapy Los Angeles