Synopsis

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

Licorice (Glycyrrhiza glabra) has a long history of use in traditional medicine systems such as Traditional Chinese Medicine (TCM) and Ayurveda for treating respiratory ailments, including those with allergic components like asthma or allergic rhinitis. In these traditions, licorice is valued for its demulcent (soothing), anti-inflammatory, and expectorant properties. Practitioners often include licorice in herbal formulas to support the lungs, soothe mucous membranes, and reduce symptoms such as coughing and wheezing.

Scientific evidence regarding licorice specifically for respiratory allergies is limited and largely preclinical. Some in vitro and animal studies suggest that glycyrrhizin and other flavonoids in licorice may possess anti-inflammatory and immunomodulatory effects, which could theoretically help reduce allergic responses in airway tissues. However, robust human clinical trials directly evaluating licorice’s efficacy in treating or preventing respiratory allergies are lacking. Most available studies focus on broader anti-inflammatory or antiviral properties rather than allergy-specific outcomes.

Thus, while licorice is traditionally used for respiratory complaints, and there is some mechanistic rationale, the scientific evidence for its use specifically in treating respiratory allergies is weak. Caution is advised due to potential side effects, especially with long-term or high-dose use, such as hypertension and hypokalemia.

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