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 PDF) Effects of a Superpotent Melanotropic Peptide in Combination With Solar UV Radiation on Tanning of the Skin in Human Volunteers Martina Big Says She's Black From Melanotan II Injections Misinformation Melanotan 1 (MT1) 10mg Select Peptides 100% Lab Tested