GHK Cu Copper Peptide Regeneration, Skin Renewal & Anti Age GHK Cu is a powerful copper peptide that supports collagen production, skin and hair health, and tissue repair. It may help reduce fine lines, improve elasticity, and promote faster healing. Want to learn 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)