title: Letter: Megavitamin therapy.
mesh_terms: D001205:Ascorbic Acid / Q000627:therapeutic use; D006801:Humans; D014801:Vitamin A / Q000627:therapeutic use; D014807:Vitamin D / Q000627:therapeutic use; D014815:Vitamins / Q000627:therapeutic use*
chemical_list: D014815:Vitamins; D014801:Vitamin A; D014807:Vitamin D; D001205:Ascorbic Acid