Boerhavia diffusa, commonly known as Punarnava, is a plant widely used in traditional Ayurvedic medicine, particularly for supporting urinary and bladder health. In Ayurveda, it is believed to possess diuretic, anti-inflammatory, and rejuvenative properties, and is often included in formulations intended to manage conditions such as urinary tract infections, kidney stones, and general urinary discomfort. The plant is said to "revitalize" the urinary system and to help in "removing excess fluids" from the body.

Scientific studies on Boerhavia diffusa have largely focused on its diuretic and nephroprotective effects in animal models. Some preclinical research has indicated that extracts of the root may increase urine output and show anti-inflammatory activities. However, robust clinical trials in humans specifically validating its efficacy for bladder health are limited. The majority of available evidence is therefore based on its longstanding use in traditional systems of medicine, rather than on rigorous modern scientific investigation.

In summary, the use of Boerhavia diffusa to support the bladder and urinary system is primarily justified by traditional use, with some preliminary pharmacological support but lacking strong clinical evidence in humans.