Niacin is a vitamin used to treat high cholesterol, pellagra, cholea, arthritis, Raynaud's disease, Meniere's disease, and atheroclerosid (clogged arteries) Other names for Niacin include: Inositol Hexnl=iacinate, Niacinamide, Vitamin B3, Niotinamide, and nicotinic Acid. Check with your doctor before taking Niacin.