GHK-Cu is a naturally occurring copper-binding peptide complex (glycyl-L-histidyl-L-lysine) that has been widely studied for its role in cellular signaling, tissue remodeling, and regenerative processes.

In experimental and preclinical research settings, GHK-Cu has been associated with modulation of gene expression, collagen synthesis, and extracellular matrix remodeling, making it a key compound of interest in skin, hair, and wound-healing models.