Product Reviews
Ashwagandha Supplements Review

Reviewed and edited by Tod Cooperman, M.D. Tod Cooperman, M.D.
Initial Posting: 6/16/18 Last Update: 5/27/20

Find the Best Ashwagandha Supplement

Only 56% of Ashwagandha Products Pass Tests
Ashwagandha supplements reviewed by
Alphabetical list of ashwagandha supplement brands compared in this review
GNC Herbal Plus Ashwagandha Organic India Ashwagandha Solaray Ashwagandha
Himalaya Ashwagandha plnt by V [Vitamin Shoppe] Ashwagandha Solgar Ashwagandha Root Extract
Jarrow Formulas Ashwagandha ProHealth Optimized Ashwagandha Sundown Naturals Stress Support
Life Extension Optimized Ashwagandha Extract Pure Encapsulations Daily Stress Formula Vitacost Ashwagandha Complex
Nature's Answer Ashwagandha Puritan's Pride Ashwagandha Vitamin World Ashwagandha Extract
Nature's Way Standardized Ashwagandha    
GNC Herbal Plus Ashwagandha Himalaya Ashwagandha Jarrow Formulas Ashwagandha Life Extension Optimized Ashwagandha Extract Nature's Answer Ashwagandha Nature's Way Standardized Ashwagandha Organic India Ashwagandha plnt by V [Vitamin Shoppe] Ashwagandha ProHealth Optimized Ashwagandha Pure Encapsulations Daily Stress Formula Solaray Ashwagandha Solgar Ashwagandha Root Extract Sundown Naturals Stress Support Vitacost Ashwagandha Complex Vitamin World Ashwagandha Extract
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Summary: What You Need to Know About Ashwagandha Supplements
  • Does it work? Preliminary studies suggest that ashwagandha may help reduce anxiety, improve physical and cognitive performance, and have other benefits. However, larger studies are needed for confirmation.
  • How to choose? When choosing an ashwagandha product, look for a root powder or a root extract containing, respectively, at least 0.3% and 1.5% of withanolides — key marker compounds which may also play a role in the herb's activity.
  • How much to take? Daily dosage for a root powder is typically 1 to 6 grams (1,000 mg to 6,000 mg). For extracts it is 500 mg to 1,500 mg. A daily dose should provide at least 6 mg of withanolides — typically between 10 mg and 30 mg has been used in most studies.
  • What did testing find? Many products contained lower amounts of withanolides than expected and only 56% of the products selected for testing were Approved. The amount of withanolides in a suggested daily serving ranged from just 0.57 mg to as much as 95.3 mg. The cost to obtain 6 mg of withanolides ranged from just 7 cents to $1.24. Price was not an indicator of quality. (See What CL Found).
  • Best Products? Several products were Approved for Quality and provide doses of withanolides consistent with efficacy in clinical studies. Among these, one product was selected as a Top Pick, offering superior strength and at low cost for withanolides. Several additional products represent good, well-priced alternatives.
  • Safety and Side Effects: Ashwagandha supplements are generally well-tolerated when taken short-term (weeks to a few months) in typical dosages; however, mild to moderate side effects such as headache, sleepiness, and stomach upset have been reported in clinical studies. Rarely, elevated liver enzymes and liver injury, allergic reactions, and rapid heartbeat have been reported. Ashwagandha can also potentially lower blood pressure and blood sugar, and increase thyroid hormone levels. There are no long-term studies on the safety of ashwagandha supplements. For more details, see Concerns and Cautions.
You must be a member to get the full ashwagandha test results and reviews for 15 supplements including extracts, root powders, and combination products. Nine of these were selected for review by and six others passed the same testing in CL's voluntary Quality Certification Program. In the review, you'll learn:
    • ConsumerLab's Top Pick for ashwagandha based on quality, purity, dose, and value
    • Which products passed or failed our tests and why
    • How ashwagandha supplements compare on ingredients, dosage, amounts of withanolides, and cost
    • Ashwagandha dosage for specific uses, such as reducing anxiety and improving memory  
    • The amount of withanolides in each ashwagandha supplement and dosage to look for
    • How ashwagandha root powders and root extracts differ, and what they have been shown to do
    • Clinical information about whether ashwagandha works for anxiety and improving memory
    • Price comparisons showing how to get the best ashwagandha at lowest cost
    • Safety, side effects, and potential drug interactions with ashwagandha

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