Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Imagine just wanting to be jacked and tan and you end up like this? Melanotan II is a peptide that increases the melanin in your skin and can give men a boner that Tanning from the inside out = Highly Dangerous and Illegal! Many products advertised on social media platforms promising a tan from the inside out or a tan without sun such Melanotan II (MT II) Peptide Therapy Beverly Hills No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn