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 GHK Cu for Skin Rejuvenation WeCare Pharmacy Just started GHK Cu? Heres what to expect, This isnt 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 Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000