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GHK-Cu (glycyl-L-histidyl-L-lysine copper(II) complex) is a naturally occurring human tripeptide sequence that coordinates Cu²⁺ in a 2:1 (peptide:copper) complex. It has been investigated in preclinical and in-vitro model systems across research areas including extracellular-matrix regulation, gene-expression modulation, and copper-mediated redox chemistry.