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 goop Peptide Stacking Is EverywhereBut Should You Be Doing It? BPC 157, TB 500, and GHK Cu: Separating Fact from Fear in Cancer Concerns Gabriel Alizaidy, MD, MS posted on the topic LinkedIn GHK Cu Peptide: Turn Back the Clock Naturally Calibrate Hydration