GHK-Cu (Glycyl-L-Histidyl-L-Lysine copper complex) is a naturally occurring tripeptide-copper(II) chelate with a peptide molecular weight of 340.38 g/mol, originally isolated from human plasma and subsequently characterized in saliva and urine. The compound coordinates Cu(II) via the imidazole side chain of histidine, the alpha-amino group of glycine, and the deprotonated amide nitrogen of the peptide bond, forming a stable planar complex. This 50mg research vial is intended for in vitro laboratory investigations into extracellular matrix signaling, collagen biosynthesis regulation, antioxidant gene expression, and copper transport pathway modeling.