Why does your hair turn gray? National Geographic Do you have to worry about gray hair after a hair transplant? Nasal sprays containing the 'Barbie Drug' melanotan are very, very dangerous and completely unregulated, according to leading dermatologist. Experts say there has been a surge in the use of the illegal tanning aid Melaniq Dietary Supplement, Supports Melanin Production, Slows Hair Greying Walmart.com What is Melanotan II the drug that the TGA urges consumers to avoid? A recent study has revealed why hair turns gray with age and offers new hope for reversing this process. The research focuses on melanocyte stem cells (McSCs), the cells responsible for hair