Evidence supporting the use of: Licorice (unspecified)
For the health condition: Colds (decongestant)

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Synopsis

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

Licorice (Glycyrrhiza glabra) has a long history of traditional use in the treatment of upper respiratory tract infections, including colds. In traditional Chinese medicine and other herbal systems, licorice root is used as an expectorant and soothing agent for sore throats and coughs. The demulcent (soothing) property of licorice is thought to help calm irritated mucous membranes, which may indirectly provide symptomatic relief for cold symptoms such as cough and throat discomfort. Additionally, licorice contains glycyrrhizin, which has demonstrated some anti-inflammatory and antiviral properties in laboratory studies. However, while these findings are promising, there is limited high-quality clinical evidence specifically supporting licorice's effectiveness as a decongestant for colds in humans. Most modern research focuses on its antiviral or anti-inflammatory mechanisms in vitro or in animal studies, with little direct evidence of clinical benefit for nasal congestion. Therefore, licorice’s use as a decongestant in colds is primarily based on traditional practices rather than robust scientific validation. Caution is also warranted as excessive or prolonged use of licorice can have adverse effects, including increased blood pressure and electrolyte imbalance.

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