Copper peptide questions we get asked all the time How often should you use it? Do you need to avoid the sun? If you're new, start once daily ( evenings are great), Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 7% GHK CU ACCELERANT 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: