GHK Cu Peptide Regenerative & Cosmetic Research Glowyour way. Meet GHK Cu, our glow enhancing copper peptidenow available in both a luxe topical cream and an injectable option, personalized to how you want to elevate your results. This is the Just started GHK Cu? Here's what to expect This isn't an overnight peptide, it builds Weeks 12: You may start noticing small shiftsskin feels a bit smoother, nails a little stronger Weeks 34: 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