Synopsis

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

Aerva lanata, commonly known as "Mountain Knotgrass" or "Polpala," has been traditionally used in various systems of folk and Ayurvedic medicine for the treatment of edema, urinary disorders, and kidney-related ailments. Its use as a diuretic is well-documented in ethnobotanical and Ayurvedic literature, where it is believed to promote diuresis and thereby help in reducing excess fluid retention associated with edema. Several classic Ayurvedic texts mention Aerva lanata (as "Pashanabheda") for its ability to "break stones" and as a useful remedy in dropsy (edematous conditions).

Scientific validation of these claims is limited. A few preliminary pharmacological studies have indicated that extracts of Aerva lanata possess mild diuretic activity in animal models, supporting its traditional use for promoting urine output. For instance, some rodent studies have shown increased urine volume and electrolyte excretion following administration of plant extracts. However, these studies are limited in number, often not done in humans, and generally lack rigorous clinical trial data.

In summary, the use of Aerva lanata for edema is primarily justified by traditional use, with some weak scientific support from preclinical studies (hence, evidence rating 2). There is a need for more robust, well-designed clinical trials to conclusively validate its efficacy and safety for edema in humans.

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