Melanotan I is a synthetic peptide analogue of the natural hormone alpha-Melanocyte Stimulating Hormone (α-MSH). It is specifically engineered to stimulate melanogenesis—the production of melanin pigment in the skin. Research indicates it can promote a natural-looking tan by increasing eumelanin production, which also provides inherent protection against UV radiation. It is studied for its targeted approach to skin pigmentation with a focus on selectivity for melanocortin-1 receptors (MC1R).