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 GHK Cu Peptide Serum 30 ml, Copper Peptide Serum with Hyaluronic Acid for Tightening, Collagen Boosting Copper Peptide Serum Benefits: Complete Guide to GHK Cu Glimmer Goddess GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B