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 Glow Peptide AH Clinics Copper Peptide Regenerating Serum for Glowing Skin and Hair Not all peptides are created equal. And not all peptide sources are safe. At Synergy, every protocol starts with a complimentary consultation with a provider who actually knows what they're doing.