What is Melanotan II the drug that the TGA urges consumers to avoid? Melanotan II: Tanning injections, nasal sprays harmful to health 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 as injectable Melatonin: Your Body's Natural Sleep Hormone Melanotan vs. Astaxanthin for Glowing Skin Cardiologists warn that while melatonin may help you sleep, it might not be safe for your heart. Heres what you need to know.