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No, vitamin C does not help prevent colds. A meta-analysis[1] of 10,708 participants in various studies showed that the risk ratio of contracting a cold while on vitamin C prophylaxis was 0.97 for the general populace.
Plus that vitamin C could reduce chances of catching a cold (though the jury's still out on just how much impact C has on immunity). And lemons have another major plus: They're an antioxidant powerhouse (in addition to all the vitamin C) Suppressive effects of citrus fruits on free radical generation and nobiletin, an anti-inflammatory polymethoxyflavonoid.