Carr A B, Einstein R, Lai L Y, Martin N G, Starmer G A
Med J Aust. 1981 Oct 17;2(8):411-2. doi: 10.5694/j.1326-5377.1981.tb101032.x.
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%.
