Melanotan II: Tanning injections, nasal sprays harmful to health Melanotan What It Is and Its Relation to Skin Cancer I accidentally undid years of skin work and didnt realize it until it was too late., At the beginning of November, I started taking melanotan 2 and honestly?, I loved it., My tan deepened 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 Dangerous' tanning products promoted by influencers Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn