GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B 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 Supra Chems The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline