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), Can You Use GHK Cu Peptides with Vitamin C Serum? Expert Guide Copper Peptides Serum for Face 2% GHK CU & 4% EGF Seraphime The research on GHK Cu goes back over 40 years a scientist dedicated his entire career to it. Your body already makes it. You just make about 60% less of it by GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution