Melanotan II (Tan Jabs): Why They're Not Worth The Risk Peptides are having a moment, but not all of them are harmless., One thats getting a lot of attention right now? Melanotan II., Its being used to achieve a tan from the inside, but what it Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn The Hidden Dangers of Tanning Nasal Sprays That You Should Be Aware Of Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn