What Are Performance Peptides and Are They Safe for Athletes? Peptides GymHub NL GHK Cu (TETRAPEPTIDE + CU) Synthagen Synthagen PL GHK Cu, is a naturally occurring copper peptide already found in the body Sometimes referred to as Botox in a bottle. , As we age, our natural levels of it declinewhich is why its often GHK Cu Copper Peptide for Research GhostLabz Molecular crystal structure of the tripeptide GHK Cu. In solution, Download Scientific Diagram