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 Melanotan II (Tan Jabs): Why They're Not Worth The Risk How Long Does It Take For Melanotan To Work? Well its that time of year and the MT2 questions are flooding the DMs so thought if quickly cover how I personally like to use MT2 to get all the possitives and avoid the nausea. As usual this is Emerging Threat: Melanotan, Repackaging, and Online Sales