Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Melanotan is trending again. As a dermatologist, I strongly need to tell you , Its an unapproved injectable peptide, and were seeing:, nausea and flushing, darkening of existing moles, Emerging Threat: Melanotan, Repackaging, and Online Sales Don't risk using tanning products containing melanotan Therapeutic Goods Administration (TGA) You Should Avoid Using Nasal Tanning Sprays