GHK Cu Copper Peptide Face Tonic for Firmer Looking Skin 2 weeks in on GHK Cu and the glow is REAL. Brighter complexion More even skin tone Less breakouts Softer fine lines Thicker, fuller hair This is just Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule Injectable GHK Cu: Beginner's Guide to Copper Peptide