GHK Cu is a copper peptide that plays a role in tissue repair and collagen synthesis. The result: improved texture, firmness, and overall skin quality. GHK CU Face Cream: Anti Aging & Firming Solution Cellular Glow Copper Peptide GHK Cu Serum for Face GHK Cu: The Peptide That Supports Healthy Aging GHK Cu (copper peptide) is naturally occurring in the body and plays a role in supporting skin health, collagen production, and tissue repair. As Modulation of Fibroblast Phenotype and Collagen Synthesis by GHK Cu in Prime Lab Peptides