GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a synthetic tripeptide that naturally occurs in human plasma, saliva, and urine. It has been the subject of peer-reviewed in vitro and preclinical animal research examining its potential role in cellular signaling, extracellular matrix remodeling, and antioxidant pathway modulation. This compound is intended strictly for use in qualified laboratory research environments by trained scientific personnel.