Synopsis

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

Aster root, which comes from plants in the Aster genus (such as Aster tataricus), has a long history of use in traditional medicine systems, particularly in East Asia. In Traditional Chinese Medicine (TCM), aster root—known as "Zi Wan"—is commonly used as an expectorant to relieve coughs and support the treatment of respiratory conditions, including colds often associated with fever. The root is thought to clear phlegm, moisten the lungs, and stop coughs. Its use is documented in classical TCM texts and is included in various herbal formulations for respiratory ailments.

However, while there is substantial tradition behind its use, modern scientific studies to confirm its efficacy for treating colds, especially those with fever, are limited. Some laboratory studies have shown that compounds in aster root may have anti-inflammatory and antimicrobial effects, which could theoretically help in respiratory infections. Still, robust clinical trials in humans are lacking. Therefore, the evidence supporting its efficacy is based mainly on historical and traditional use, rather than on high-quality scientific data. For this reason, the evidence rating is 2, reflecting the presence of traditional use and limited preclinical data, but insufficient scientific validation through rigorous clinical studies.

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