GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? Glow from within with GHK Cu Copper Peptide , This powerhouse peptide supports collagen production, skin repair, and hair follicle health, helping improve skin firmness, radiance, and support G H K the beauty peptide everyone's talking about If you're serious about skin health from the inside out, GHK (glycyl L histidyl L lysine) is one to know. Naturally found in the body,