Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Citrus fruits (such as oranges, lemons, limes, and grapefruits) are commonly associated with cold prevention due to their high vitamin C content. The traditional use of citrus for colds is widespread, but there is also scientific investigation into this association. Several clinical trials and meta-analyses have assessed the efficacy of vitamin C in preventing and treating the common cold. While routine vitamin C supplementation in the general population does not significantly reduce the incidence of colds, some studies suggest that vitamin C may slightly reduce the duration and severity of cold symptoms. In particular, individuals exposed to brief periods of severe physical stress (e.g., marathon runners) have shown some benefit from vitamin C supplementation. Citrus fruit itself is a natural dietary source of vitamin C and provides additional nutrients and antioxidants, although direct studies on citrus fruit specifically (rather than vitamin C supplements) are limited. Overall, the scientific evidence supporting the use of citrus (mixed) for the prevention of colds is modest, and benefits, if any, are likely to be small. Therefore, while citrus is a healthy dietary choice, it should not be relied upon as a primary means of preventing colds.

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