title: The vitamin C controversy.
mesh_terms: D001205:Ascorbic Acid / Q000627:therapeutic use*; D003139:Common Cold / Q000517:prevention & control*; D004311:Double-Blind Method; D006801:Humans; D010919:Placebos; D012107:Research Design / Q000592:standards*
chemical_list: D010919:Placebos; D001205:Ascorbic Acid