Melanotan-II is a cyclic synthetic analog of alpha-melanocyte-stimulating hormone designed to activate multiple melanocortin receptors with high potency. Preclinical research has investigated Melanotan-II for its roles in melanogenesis and UV-independent pigmentation, sexual arousal and erectile function through MC4R pathways, appetite regulation, and compulsive behavior neuroscience. Its potent and non-selective melanocortin receptor agonism provides researchers a comprehensive tool for studying the melanocortin system's diverse physiological roles. PeptideBull provides Melanotan-II at confirmed research-grade purity. Not for human or veterinary consumption.