Synopsis

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

Citrus spp. (such as oranges, lemons, and grapefruits) have been traditionally used to help treat and prevent colds, largely due to their high vitamin C content and refreshing qualities. Historical use is widespread, with many cultures recommending citrus fruits or juices for the common cold as part of folk medicine. The idea that vitamin C can help with colds became especially popular in the 20th century, notably after Linus Pauling advocated for high-dose vitamin C supplementation. While citrus fruits are rich in vitamin C and other bioactive compounds (like flavonoids), scientific studies have shown only modest benefits. Meta-analyses indicate that regular vitamin C supplementation might slightly reduce the duration and severity of cold symptoms, but does not prevent colds in the general population. There is no clear evidence that taking vitamin C after the onset of symptoms has a significant effect. Direct antiviral effects from citrus itself have not been robustly demonstrated in clinical studies. Nonetheless, the long-standing traditional use, combined with the known nutritional benefits, supports its continued popularity for colds, even if scientific validation is limited.

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