GHK Cu Copper Peptide Collagen Boost & Skin Regeneration Calibrate Hydration Peptide Therapy for Hair Growth: Explore Your Options 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: Copper peptide questions we get asked all the time , How often should you use it? Do you need to avoid the sun?, If youre new, start once daily (evenings are great), then build up if your skins