Synopsis

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

Knotgrass, a name that may refer to several species such as Polygonum aviculare, has a long history of use in traditional herbal medicine, particularly in Europe and Asia. In folk medicine, knotgrass has been used to support urinary health, including as a diuretic (to increase urine flow), for relief from urinary tract discomfort, and for the management of kidney stones and bladder complaints. Traditional European herbalists included knotgrass in formulations aimed at “flushing” the urinary tract, and some old texts describe its use for “stone” (kidney or bladder stones). Similarly, traditional Chinese medicine has employed related Polygonum species for urinary support.

Despite this historical usage, the scientific validation for knotgrass’s effects on the urinary system is limited. Some laboratory studies have identified the presence of flavonoids, tannins, and other phenolic compounds in knotgrass, which may have mild diuretic or anti-inflammatory properties. However, robust clinical trials in humans are lacking, and the evidence for efficacy is primarily anecdotal or based on traditional use rather than modern research. Safety data for long-term or high-dose use is also sparse.

In summary, knotgrass is used to support the urinary system primarily due to traditional practices and historical texts, rather than strong scientific evidence. Its rating reflects a reliance on traditional use with limited scientific corroboration.

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