Synopsis

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

Citrus spp., such as oranges, lemons, and limes, have a long history of use in traditional medicine for the management of colds, particularly as a decongestant or to alleviate respiratory symptoms. The primary basis for this use is cultural and historical rather than robust scientific evidence. In many traditional systems, citrus juices and peels were consumed for their perceived ability to "cut phlegm" and provide symptomatic relief through their tartness and vitamin content. Citrus fruits are high in vitamin C, and while vitamin C supplementation has been investigated for its role in cold prevention and treatment, the evidence largely shows only minimal benefit in reducing the duration or severity of colds, and not specifically as a decongestant. Some volatile oils in citrus peels (like limonene) have mild expectorant properties, but clinical evidence supporting their use as decongestants is lacking. Overall, the use of Citrus spp. for colds is mainly rooted in tradition, with limited scientific validation for its efficacy as a decongestant. Most modern recommendations for citrus intake during colds relate to general immune support and hydration rather than direct decongestant action.

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