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 That quick tan injection is NOT worth the risk., Melanotan peptide injections stimulate pigment cells, and its use has been linked to rapid changes in moles, including the potentially fatal skin PDF) Melanotan Tanning Injection: A Rare Cause of Priapism Can You Take Too Much Melanotan? A Z Guide What is Melanotan 2? Honest Peptide