Peptide dosing Synthagen PL GHK Cu: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration GHK Cu Peptide for Hair Growth: Science, Benefits, and How It Works GHK Cu (Copper Peptide) is a naturally occurring peptide in the body that binds with copper to support cell repair and renewal. As we age, our levels decrease and thats where supplementation or ANAIRUI Copper Peptides GHK Cu Serum