Amazon.com: QUBIT GHK Cu Copper Peptide Supplement for Skin & Hair, Easy to Absorb, Precisely Dosed 90 Vegan Capsules : Health & Household 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 (GHK Cu) 2% Recovery Serum GHK Cu Copper Peptide Regeneration, Skin Renewal & Anti Age