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Vitamin C and the common cold: using identical twins as controls
The Medical Journal of Australia
|October 17, 1981
Abstract:
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%.