GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect Let's talk peptides next up: GHK Cu GHK Cu is a copper peptide known for its role in skin health, healing, and overall rejuvenation. Naturally found in the body, it helps support GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu is one of the most powerful regenerative peptides for skin, hair, and overall tissue health. GHK Cu supports collagen production, healing, and visible rejuvenation from within. It's commonly used to improve GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack?