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 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 The "Barbie Drug" Has a Dark Side How I Got Tan In 2 Weeks Melanotan II (Tan Jabs): Why They're Not Worth The Risk