We are OBSESSING over this Melanotan II transformation After only 14 days using the Melanotan injections combined with one day of laying in the sun, can you believe the difference?? Nothing Melanotan II Alchetron, The Free Social Encyclopedia 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 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 Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn