Vitamin C and the common cold: using identical twins as controls.
We analysed self-reported cold data for 95 pairs of identical twins who took part in a double-blind trial of vitamin C tablets. One member of each twin pair took vitamin C and the other took a well matched placebo each day for 100 days. Vitamin C had no significant effect except for shortening the average duration of cold episodes by 19%.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001205:Ascorbic Acid / Q000627:therapeutic use*; D002648:Child; D002986:Clinical Trials as Topic; D003139:Common Cold / Q000188:drug therapy / Q000517:prevention & control*; D004200:Diseases in Twins; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011247:Pregnancy; D013997:Time Factors; D014430:Twins, Monozygotic
D001205:Ascorbic Acid