Ashwagandha

Ashwagandha is a traditional Ayurvedic herb that is now widely sold as a dietary supplement. Small, short studies of particular preparations suggest possible benefits for perceived stress and sleep, but they do not show that the herb will work for every person or replace evaluation and care for sleep, mood, or other health concerns. NCCIH notes that evidence for anxiety is unclear and that many studies are small and use different preparations.

What It Is

Ashwagandha's been around for like 3,000 years, which is wild when you think about it. Right? The Sanskrit name literally means "smell of horse," which sounds gross but it's actually referring to the strength and vitality of a horse. Trust me, the actual root doesn't smell that bad.

Ashwagandha grows in parts of India, the Middle East, and Africa. Its ability to grow in difficult environments does not demonstrate an effect on human stress; findings from laboratory or animal research cannot by themselves establish a benefit in people.

Supplements commonly contain root, leaf, or root-and-leaf extracts. "Adaptogen" is a traditional and marketing term, not a diagnosis or proof that an herb can correct stress, sleep problems, or hormone changes. Different preparations are not interchangeable in research.

In Ayurveda, ashwagandha is described as a rasayana, a traditional category associated with vitality and longevity. That traditional use is meaningful cultural context, but it is not clinical proof that ashwagandha prevents disease, treats symptoms, or replaces health care.

What Research Can and Cannot Say

Human research is limited to specific preparations. Small, short randomized trials have reported lower scores for perceived stress and sometimes lower cortisol levels with some extracts, but results cannot show that ashwagandha "regulates" cortisol or treats a stress-related condition. Evidence about anxiety remains unclear. NCCIH

For sleep, a 2021 systematic review of five trials found a small improvement compared with placebo. The evidence came from about 400 adults over 6 to 12 weeks, with small samples, inconsistent measures, and varying products, so it does not establish a reliable effect for every sleep problem. Read the systematic review.

Ashwagandha should not be presented as thyroid support. Small trials found changes in thyroid hormone measures and case reports describe thyrotoxicosis, which is a safety concern rather than proof of treatment. NCCIH says there is not enough evidence to determine whether ashwagandha helps menopause or many other conditions. NIH Office of Dietary Supplements

Traditional use and early research can be reasons to learn more, not reasons to self-treat anxiety, insomnia, thyroid disease, or menopausal symptoms. Persistent, severe, or changing symptoms deserve appropriate clinical attention.

Research and Safety

Research used different plant parts, extraction methods, standardized products, amounts, and study lengths. Those differences mean the studies do not provide a dependable self-dosing, timing, or product-selection guide for powders, capsules, or tinctures. This page is for research, not a recommendation to buy or use a particular product.

Short-term use of ashwagandha preparations, up to about 3 months, appears generally tolerated in studies, but long-term safety is unknown. Reported effects include drowsiness, stomach upset, loose stools, nausea, vomiting, and rare cases of liver injury. NCCIH safety information

Ashwagandha should be avoided during pregnancy and breastfeeding. It is not recommended before surgery or for people with autoimmune or thyroid disorders, and it can interact with diabetes, blood-pressure, immunosuppressant, sedative, anti-seizure, and thyroid-hormone medicines. People with hormone-sensitive prostate cancer should avoid it. A clinician or pharmacist can help assess medication and health-condition questions. NIH Office of Dietary Supplements

In the United States, ashwagandha products are generally sold as dietary supplements, not FDA-approved treatments. The FDA does not approve dietary supplements for safety and effectiveness before sale. FDA dietary-supplement information Ashwagandha and Bai Shao come from different traditions; this page does not recommend combining them.