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 a long history of use for respiratory conditions, including symptoms associated with influenza such as dry cough and sore throat. In TCM, glehnia root is considered to nourish the lung yin and clear heat, making it a common component in herbal formulas for treating upper respiratory tract infections and flu-like illnesses. Historical texts such as the Shen Nong Ben Cao Jing and various classical TCM materia medica reference its use for pulmonary complaints that overlap with influenza symptoms.

However, while modern pharmacological studies have identified some anti-inflammatory, immunomodulatory, and antioxidant properties in extracts of glehnia root, there is limited direct scientific evidence supporting its efficacy specifically against influenza viruses. Most available research focuses on its general effects on respiratory health or its ability to modulate immune response, rather than rigorous clinical trials targeting influenza. As such, its use for influenza is primarily justified by traditional practice rather than robust scientific validation. The evidence rating is 2, reflecting traditional backing and some preliminary pharmacological data, but a lack of high-quality clinical evidence.

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