Pptido de cobre GHK GHK Cu Tripptido 1 GHK Cu Hair Growth 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 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), Neurogan GHK Cu (Copper Peptide) Neck & Face Serum 1,200mcg (1 oz bottle)