Clinically important side effects of Melanotan II and placebo Download Table Nasal tanning spray warning We've become aware of widespread availability of nasal sprays containing Melanotan II, mostly on line, but also through gyms and salons. The sprays are promoted as a safe way Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky