Evidence supporting the use of: Polygonum
For the health condition: Congestion (bronchial)

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Synopsis

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

Polygonum species, especially Polygonum cuspidatum (Japanese knotweed) and Polygonum aviculare (knotgrass), have been used in traditional medicine systems across Asia and Europe for various respiratory ailments, including bronchial congestion. In traditional Chinese medicine (TCM), Polygonum cuspidatum is known as "Hu Zhang" and is used to "clear heat," "remove toxins," and "resolve phlegm," which can relate to symptoms of bronchial congestion. European folk medicine also references the use of knotgrass as an expectorant and remedy for coughs and lung congestion. However, these uses are primarily based on traditional practices and anecdotal accounts rather than robust clinical research.

There is a lack of high-quality scientific studies specifically investigating Polygonum species for bronchial congestion. Some laboratory studies have indicated anti-inflammatory and antimicrobial effects of Polygonum extracts, which could theoretically help in respiratory infections, but direct evidence for efficacy in bronchial congestion in humans is lacking. Therefore, the support for this use is mainly traditional, and the evidence strength is modest, meriting a rating of 2.

More about Polygonum
More about Congestion (bronchial)

Other ingredients used for Congestion (bronchial)

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