Synopsis

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

Aster tataricus (commonly known as Zi Wan in Traditional Chinese Medicine) has a long history of use for treating coughs, particularly those that are persistent or spasmodic in nature. Historical texts and materia medica from Chinese medicine describe Zi Wan as having expectorant and antitussive (cough-suppressing) properties. It is commonly used in combination with other herbs in formulas intended to relieve cough, clear phlegm, and moisten the lungs. The traditional rationale is based on the herb’s purported ability to facilitate the movement of lung qi and resolve phlegm, thereby reducing cough symptoms.

Regarding scientific validation, there is limited but suggestive preclinical evidence. Some in vitro and animal studies indicate that extracts of Aster tataricus may possess antitussive and expectorant effects, possibly attributable to compounds like saponins and triterpenoids. However, robust clinical trials in humans are lacking, and the mechanisms of action remain incompletely understood. Thus, while its use is well-supported by tradition and some laboratory data, high-quality human evidence is insufficient. As a result, the primary justification for its use remains traditional, with a moderate evidence rating due to the absence of substantial clinical validation.

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