Dangerous 'Barbie drug' Melanotan II sparks crackdown on social media influencers ABC News Melanotan peptide might seem like the cool thing to doit makes you look tan., But these unregulated injections come with real risks., They can cause unpredictable skin changes, including darkening of Melanotan Tanning Injections The Low Down Lynton Lasers Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn