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 a long-standing use for treating cough and related respiratory symptoms. Traditional texts describe glehnia root as nourishing lung yin, moistening dryness, and alleviating coughs—especially those caused by heat or dryness in the lungs. It is commonly used in classical formulas for chronic dry coughs or coughs associated with lung yin deficiency. The root is believed to soothe the throat and reduce irritation, making it popular in herbal remedies for persistent, non-productive coughs.

Modern scientific studies on glehnia root are limited, and most evidence supporting its use comes from historical and clinical experience in TCM rather than rigorous clinical trials. Some phytochemical research has identified compounds in glehnia root with potential anti-inflammatory and immunomodulatory properties, which could theoretically contribute to cough relief. However, these findings are preliminary and have not been directly linked to clinical outcomes in humans. Thus, while there is traditional support and some pharmacological rationale, high-quality scientific validation is lacking. Glehnia root remains a respected herb in TCM for cough, but its use is justified primarily by tradition rather than by strong scientific evidence.

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