Copper-binding tripeptide naturally present in human plasma.
GHK-Cu is a copper complex of the tripeptide glycine-histidine-lysine, classified as a signaling copper peptide.
The peptide binds copper ions with high affinity, forming a stable bioactive complex.
Referenced in studies on extracellular matrix signaling, peptide–metal interactions, and cellular communication.
Frequently cited in cosmetic peptide research and copper metabolism literature.