Melanotan What It Is and Its Relation to Skin Cancer Melanotan II (Tan Jabs): Why They're Not Worth The Risk 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 Nasal tanning sprays warning issued by Trading Standards Melanotan What It Is and Its Relation to Skin Cancer