Synopsis

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

Citrus fruits and their extracts have been traditionally used to help manage symptoms of the common cold. This historical use is largely based on the presence of vitamin C (ascorbic acid), flavonoids, and essential oils in various citrus species (such as oranges, lemons, grapefruits, and limes), which are believed to support immune function and possess mild antimicrobial effects. Folk medicine practices across cultures have recommended citrus in the form of juices, teas, or infusions as a remedy to soothe sore throats and reduce cold symptoms.

However, scientific validation for the direct antiviral effects of citrus against cold viruses (primarily rhinoviruses and coronaviruses) is limited. While vitamin C has been studied extensively, meta-analyses show that regular supplementation may slightly reduce cold duration but does not prevent colds in the general population. The antiviral activity attributed to certain citrus polyphenols and essential oils is supported by in vitro studies, but there is a lack of robust human clinical evidence demonstrating significant efficacy in treating or preventing colds.

In summary, the use of Citrus (Unspecified) for treating colds is grounded in traditional practices and some preclinical findings, but the overall strength of evidence is modest. It is commonly used for symptomatic relief rather than as a proven antiviral therapy.

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