GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect Topical GHK Cu: Skin Benefits, Best Forms, and Where to Buy 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 Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference