Research Implications of Melanotan 2 Peptides Core Peptides Melanotan 2 (MT 2) A synthetic research peptide studied within melanocortin receptor pathways. Widely explored in laboratory settings for its role in pigmentation signalling and neuropeptide activity. Used in research to explore: Your body already makes a hormone that tells your skin to tan. Melanotan 2 is a synthetic peptide engineered to mimic that hormone but in a version that's more potent and longer lasting than Melanotan Premium Research Peptide by SRL