The Melanotan 2 sequence (Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2) is engineered for significantly higher stability and potency compared to endogenous (α-MSH). Its cyclic structure provides resistance to rapid enzymatic degradation, extending its biological half-life in experimental models. By binding to MC1R, it initiates the production of eumelanin, while its interaction with central MC3 and MC4 receptors allows researchers to investigate more complex neurological and physiological responses.