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 1: mechanisms of action, clinical applications and safety_Chemicalbook Avoid those tanning injections! Amy Jayne Aesthetics 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 MELANOTAN EXPLAINED! Benefits, Risks, Side Effects