Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically 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 What is Melanotan II, the drug that consumers are urged to avoid? Melanotan II stimulates melanin production giving you a tan without UV exposure. The appeal: Tanning without sunburn risk Appetite suppression (side effect) Increased libido (side effect) Works