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Melanotan 1 (Afamelanotide) is a linear analogue of alpha-MSH with higher selectivity for the MC1R receptor, studied primarily for melanogenesis and photoprotection research. Melanotan 2 is a cyclic lactam analogue with broader melanocortin receptor activity across MC1R, MC3R, MC4R and MC5R subtypes. This structural difference — linear versus cyclic — results in distinct receptor binding profiles and downstream research applications. Melanotan 1 research has focused on MC1R-mediated melanogenesis, skin pigmentation increases and potential photoprotective effects. Melanotan 2 research examines the broader melanocortin system including appetite regulation (MC3R, MC4R), CNS effects and reproductive function research. Published studies have examined the pharmacokinetic profiles of both compounds, with Melanotan 1 showing longer half-life due to its modified structure. The choice of compound for research depends on which melanocortin receptor subtypes and downstream pathways are under investigation.
