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), GHK Cu Peptides Serum TryDeloura Day 5 GHK CU Glow journey @smile_and_dazzle , #ghkcucopperpeptide #ghkcu #peptides #skincare #skin How long does it take GHK Cu to work? Entera Skincare How long will a 50 mg supply of GHKCu last when dosing 2 mg daily for five consecutive days followed by two days off each week?