GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy GHK Cu is a regenerative peptide studied for its role in collagen support, tissue repair and inflammatory balance. As natural levels decline with age, interest in its broader biological impact continues to grow GHK Cu peptide is the ultimate tool of biohacking your skin. Injectable GHK Cu peptide works as a repair signal inside your skin. And when the skin functions better, the visible effects follow: Reduced GHK Cu Peptide Benefits (And a Few Risks) Explained