These are the incredible and visible results of GHK Cu phototherapy patches. No injections (that burn so bad) or nose sprays (that stings) or pills needed (affected by your digestion). Just a patch ! What is GHK Cu and Why is Everyone Talking About It? GHK Cu (Copper Peptide) is a powerful, naturally occurring compound in the body that plays a key role in skin health GHK Cu Copper Peptide Skin & Healing Beverly Hills 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),