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

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Synopsis

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

Licorice (Glycyrrhiza species) has a long history of traditional use in various cultures as a remedy for colds, particularly for its purported decongestant and soothing effects on the respiratory tract. In Traditional Chinese Medicine (TCM), licorice is commonly included in herbal formulas to "harmonize" other ingredients and to help relieve coughs and sore throats. In European folk medicine and Ayurveda, licorice root has also been used for similar purposes, including easing chest congestion and soothing irritated mucous membranes.

However, scientific evidence supporting licorice specifically as a decongestant for colds is limited. Some laboratory and animal studies suggest that certain compounds in licorice, such as glycyrrhizin, exhibit anti-inflammatory, antiviral, and expectorant properties, which may theoretically support respiratory health. Small studies have also explored its effects in combination with other herbs, but there is insufficient clinical evidence to directly validate its efficacy as a decongestant in humans with colds. Most authoritative reviews conclude that while licorice may have some benefits for sore throat and cough, robust human data for decongestant effects are lacking. Thus, licorice’s use for cold-related congestion is rooted primarily in tradition rather than strong scientific validation.

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