GHK Cu suppressed the activation of the p38 MAPK signaling pathway in Download Scientific Diagram 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 How GHK Cu Strengthens Hair Follicles to Combat Hair Loss HapiPatch 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: