Large-scale trials of vitamin C.
D001205:Ascorbic Acid / Q000008:administration & dosage / Q000627:therapeutic use* / Q000633:toxicity; D002986:Clinical Trials as Topic; D003139:Common Cold / Q000188:drug therapy* / Q000517:prevention & control; D004305:Dose-Response Relationship, Drug; D006801:Humans; D010919:Placebos; D013997:Time Factors
D010919:Placebos; D001205:Ascorbic Acid