Aerva lanata, commonly known as mountain knotgrass, is a plant used in various traditional medical systems, particularly in Ayurveda and folk medicine across India and other parts of Asia. In these traditions, it has been used to address a variety of conditions, including urinary disorders, kidney stones, and reproductive health issues. There are references in some ethnobotanical surveys and Ayurvedic texts suggesting its use for menstrual disorders, including amenorrhea (the absence of menstruation), where it is often classified as an emmenagogue—an agent that stimulates or increases menstrual flow.

Despite its traditional use, there is minimal scientific validation supporting Aerva lanata’s effectiveness in treating amenorrhea. Most available research on Aerva lanata focuses on its diuretic, anti-inflammatory, and antiurolithiatic (against kidney stones) properties. Only a few in vivo or in vitro studies have explored its effects on reproductive health, and those are generally preliminary or anecdotal. No robust clinical trials or pharmacological studies have specifically confirmed its efficacy for amenorrhea in humans.

In summary, Aerva lanata’s use for amenorrhea is rooted in traditional practice rather than scientific evidence, and the strength of supporting evidence is weak, meriting a rating of 1 on a 0-5 scale.