Synopsis

Source of validity: Traditional
Rating (out of 5): 3

Glehnia root (Glehnia littoralis), known as "Bei Sha Shen" in Traditional Chinese Medicine (TCM), has been used for centuries primarily to treat dry coughs, especially those characterized as "spastic" or non-productive coughs. In traditional practice, it is believed to nourish lung yin, clear heat, and generate fluids, thus soothing the throat and alleviating cough. The root is often included in herbal formulas for persistent dry cough, hoarseness, and throat irritation, particularly when associated with dryness or yin deficiency. Historical texts and TCM pharmacopeias document its efficacy for these symptoms, and it remains a staple in classical and contemporary Chinese herbal prescriptions.

With regard to modern scientific evidence, there are a limited number of preclinical studies suggesting anti-inflammatory, immunomodulatory, and antitussive (cough-suppressing) effects of Glehnia root extracts. However, robust clinical trials in humans are lacking, and most of the support for its use in treating spastic cough is based on traditional usage and anecdotal evidence rather than high-quality scientific validation. Therefore, while Glehnia root is widely recognized and used in traditional settings for cough (spastic), the strength of evidence is moderate and primarily historical, justifying a rating of 3 out of 5.

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