Synopsis

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

Citrus fruits—such as oranges, lemons, and grapefruits—have long been used in traditional medicine to help with colds and respiratory symptoms, including congestion. This practice is rooted primarily in the high vitamin C content of citrus fruits and their refreshing, tangy flavor, which can be soothing to a sore throat. Historical remedies often recommend warm lemon water or citrus-based drinks to help alleviate cold symptoms, though these are not true decongestants in the pharmacological sense.

Scientifically, while vitamin C has been studied extensively for its role in the immune system, current evidence suggests that routine supplementation does not prevent the common cold in the general population, though it may slightly reduce the duration and severity of symptoms. There is little direct evidence that citrus fruits or their juices act as decongestants or significantly impact nasal or sinus congestion. The soothing effect may be due more to increased fluid intake and the placebo effect than to any specific decongestant action. Overall, while citrus use for colds is traditional and has minor supportive evidence, it does not have strong scientific backing as a decongestant.

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