Melanotan II (MT II) Peptide Therapy Beverly Hills Melanotan II 10mg MC1R MC4R Melanocortin Peptide 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 White model Martina Big, who now a ''black' after taking tanning injections, announces plans to move to Africa.