Advanced GHK Cu Neck & Face Serum Premium Quality Neurogan Health Most people treat GHK Cu like it's only for hair and skin. The real leverage is in the copper signaling + repair pathways that everyone overlooks. You don't need every peptide under the GHK Copper Peptide GHK Cu Tripeptide 1 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),