Ashwagandha review & buying guide
Updated October 2026 · How we review
What it's been studied for
Stress and perceived stress, sleep quality and cortisol. Several small randomized trials report benefits; longer-term safety data are limited.
What to look for
Common branded extracts include KSM-66 (root) and Sensoril (root and leaf), each standardized to withanolides.
- Plant part and extract ratio or standardization on the label
- Amount per serving in milligrams
- Third-party testing (USP Verified or NSF)
- No claims to cure or treat disease
Cautions
Rare cases of liver injury have been reported. It may affect thyroid hormone levels and can interact with thyroid medicines, sedatives, immune-suppressing drugs and diabetes or blood pressure medicines. Not recommended during pregnancy. Some countries have restricted its sale.
For more, see the NIH National Center for Complementary and Integrative Health: Ashwagandha fact sheet.
Compare ashwagandha supplements
These links open Amazon search results so you can compare labels using our checklist. We have not lab-tested these products.
As an Amazon Associate, we earn from qualifying purchases.Important: These statements have not been evaluated by the Food and Drug Administration. Products discussed are not intended to diagnose, treat, cure or prevent any disease. This site is for general information only and is not medical advice. Talk with your doctor or pharmacist before starting a supplement, especially if you are pregnant or breastfeeding, take medication, or have a health condition.