GHK-Cu (glycyl-L-histidyl-L-lysine-copper complex) exerts its biological effects primarily through the activation of multiple signaling pathways, including the PI3K/Akt, mTOR, and MAPK pathways, which are crucial for tissue regeneration, angiogenesis, and inflammation resolution. It enhances collagen and glycosaminoglycan synthesis, promotes fibroblast activation, and exhibits anti-inflammatory and antioxidant properties, although the precise receptors and complete mechanistic details remain to be fully elucidated. Additionally, GHK-Cu has shown potential in modulating epigenetic pathways and may influence neuroplasticity, particularly in the context of aging and cognitive function.