Synopsis

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

Glehnia root (Glehnia littoralis), known as "Bei Sha Shen" in Traditional Chinese Medicine (TCM), has been historically used to treat dry cough and related symptoms. In classical TCM texts, glehnia root is described as having the ability to "nourish the lungs" and "clear heat," making it a favored remedy for dry, irritating coughs often associated with yin deficiency. Its moistening properties are thought to soothe dryness in the lung, throat, and upper respiratory tract. Traditional formulas, such as "Sha Shen Mai Dong Tang," frequently include glehnia root specifically for this purpose.

While these uses are well documented in centuries of medical literature, modern scientific validation remains limited. Some pharmacological studies have identified polysaccharides, coumarins, and other bioactive compounds in glehnia root, and preliminary research suggests mild anti-inflammatory and immunomodulatory effects. However, high-quality clinical studies confirming its efficacy for dry cough in humans are lacking. Thus, the evidence supporting its use is primarily traditional, with some suggestive but not definitive pharmacological support. Overall, glehnia root’s application for dry cough continues to be justified mainly by traditional usage and historical precedent rather than robust scientific validation.

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