I ran GHK Cu for 12 months so you dont have to (here are the results) Is it necessary to cycle on and off of every peptide? The answer may not be as simple as you think, and it depends on *why* the peptide is being used. The 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 Is it necessary to cycle on and off of every peptide? The answer may not be as simple as you think, and it depends on *why* the peptide is being used. The Buy KLOW Peptide Blend (GHK Cu, BPC 157, TB 500, KPV) (80mg) 99% Purity