How Melanotan 2 Affects Hair Colour Especially in Red or Ginger Hair Pure MT2 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 Nitisinone increases melanin in people with albinism National Institutes of Health (NIH) Melanotan 2 Tanning Peptide Here's the part nobody explains when they're selling you the "Barbie drug.", , Melanotan 2 is a synthetic peptide that mimics alpha MSH a hormone your body already makes to tell your skin cells to