The News Movement (@thenewsmovement)s video of tanning TikTok Melanotan 2 Injectable Peptide 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 Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Melanotan What It Is and Its Relation to Skin Cancer No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky