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 Does the MOTC (Melanotan II) peptide injection accumulate or stop being effective once stopped? Melanotan A Golden Tan Without the UV Damage. in Gilbert, AZ LifeSpann Primary Care & Esthetics Melanotan II in Santa Barbara, CA Eternity Health Partners