Our "No Return Necessary"
Money-Back Guarantee

If you don’t like something of ours, guess what happens next?

No, we don’t request you deliver it to a PO box in the Gobi Desert by carrier pigeon. Nor do we ask you to fill a cursed inkwell with orc’s blood and demon saliva and then use it to complete reams of return forms written in ancient Cyrillic script.

We just . . . wait for it . . . give you your money back. Holy moo cows. And that means you can say "yes" now and decide later.

Can KSM-66® ashwagandha root extract banish stress, abolish fatigue, and eliminate anxiety?

No.

Can it supercharge libido, burn body fat, and boost testosterone levels?

Absolutely not.

But can it enhance cognitive function, mood, and athletic performance and reduce inflammation and oxidative stress?

Yes. Or your money back

And how does KSM-66® ashwagandha root extract do these things?

It contains naturally-occurring bioactive compounds known as adaptogens, which support various systems in the body related to physical, environmental, and emotional resilience, including the hypothalamic-pituitary-adrenal (HPA) axis.[1][2]

The HPA axis regulates how your body responds to stress, affecting strength, power, endurance, recovery, immune function, cognition, mood, sleep, fertility, and more. Even a slight disturbance in your body’s HPA axis can impair any and all of these crucial functions.

Thus, when you take an adaptogen supplement that can aid the HPA axis like KSM-66® ashwagandha extract, your body and mind can better deal with stress.

  • 24 peer-reviewed scientific studies support our KSM-66® Ashwagandha’s form and dose[3] That’s 283 pages of scientific research that shows KSM-66® Ashwagandha works exactly like we say it does.
  • Contains no artificial fillers, food dyes, or other chemical junk[4] While these types of chemicals may not be as dangerous as some people claim, studies suggest that regular consumption of them may indeed be harmful to our health. And that’s why you won’t find them in KSM-66® Ashwagandha.
  • Analyzed for purity and potency in a state-of-the-art ISO 17025 accredited lab[5] Every bottle of KSM-66® Ashwagandha is guaranteed to provide exactly what the label claims and nothing else—no heavy metals, microbes, allergens, or other contaminants.
  • Total formulation transparency (no proprietary blends)[6] This means you know exactly what’s in every serving of KSM-66® Ashwagandha—every dose of every ingredient—and can verify the accuracy and efficacy of the formulation.
  • Made in the USA with globally sourced ingredients in NSF-certified and FDA-inspected and cGMP-compliant facilities

KSM-66® Ashwagandha is also backed by our “No Return Necessary” money-back guarantee that works like this:

If you don’t absolutely love KSM-66® Ashwagandha, just let us know, and we’ll give you a full refund on the spot. No forms or returns necessary.

So order now, try KSM-66® Ashwagandha risk-free, and see for yourself why we believe it’s the perfect ashwagandha supplement.

Can KSM-66® ashwagandha root extract banish stress, abolish fatigue, and eliminate anxiety?

No.

Can it supercharge libido, burn body fat, and boost testosterone levels?

Absolutely not.

But can it enhance cognitive function, mood, and athletic performance and reduce inflammation and oxidative stress?

Yes. Or your money back.

And how does KSM-66® ashwagandha root extract do these things?

It contains naturally-occurring bioactive compounds known as adaptogens, which support various systems in the body related to physical, environmental, and emotional resilience, including the hypothalamic-pituitary-adrenal (HPA) axis.[5][6]

The HPA axis regulates how your body responds to stress, affecting strength, power, endurance, recovery, immune function, cognition, mood, sleep, fertility, and more. Even a slight disturbance in your body’s HPA axis can impair any and all of these crucial functions.

Thus, when you take an adaptogen supplement that can aid the HPA axis like KSM-66® ashwagandha extract, your body and mind can better deal with stress.

So order now, try KSM-66® Ashwagandha risk-free, and see for yourself why we believe it’s the perfect ashwagandha supplement.

Notice to California Consumers

WARNING: Consuming this product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov/food.

Legion KSM-66® Ashwagandha Ingredient (600 milligrams per serving)

KSM-66® Ashwagandha Extract (600 milligrams per serving)

Ashwagandha root extract is an herb that’s been a cornerstone of Ayurvedic medicine for centuries. It’s derived from the ashwagandha plant, also known as Withania somnifera, which grows throughout India, Africa, and the Middle East.

KSM-66® ashwagandha extract is a patented form of ashwagandha that’s standardized to contain 5% withanolides, the bioactive compounds in the plant thought to be responsible for most of its benefits.

Although all ashwagandha supplements contain some withanolides, their concentration can range from 1% to over 35% depending on how the plants are grown, processed, stored, and other factors.[7][8] Therefore, if an ashwagandha supplement doesn’t specify its withanolide concentration, it may contain too little (ineffective dose) or too much (extreme dose).

What’s more, the source of withanolides matters as well. While KSM-66® is made only from the root of the ashwagandha plant, many manufacturers cut corners by using leaves of the plant instead. While there isn’t direct evidence this is harmful, most scientific research on ashwagandha has studied the effects of consuming the root, not the leaves.

All this is why KSM-66® is considered the gold standard for ashwagandha root extract, and particularly for use in scientific research on the plant—KSM-66® has been tested in 24 clinical trials, more than any other type of ashwagandha supplement.[9]

Research shows that supplementation with KSM-66® ashwagandha root extract . . .

The clinically effective dose of KSM-66® ashwagandha root extract is between 100 and 600 milligrams, though most research shows 600 milligrams is superior to lower doses.

Caffeine

No Artificial Food Dyes or Other Chemical Junk

Artificial food dyes aren’t a hazard per se, but studies show they can cause negative effects in some people, including gastrointestinal toxicity and behavioral disorders.[29][30][31][32][33]

No Artificial Food Dyes or Other Chemical Junk

Third-Party Lab Tested for Potency & Purity

Every bottle of KSM-66® Ashwagandha is analyzed in a state-of-the-art ISO 17025 accredited lab to verify what is and isn’t in it. That way, you know exactly what you’re getting and putting into your body.

Lab Tested for Potency & Purity
Ashwagandha Certificate of Analysis

See how Legion KSM-66® Ashwagandha compares to the rest.

  • Active Ingredient Per Serving
  • Clinically Effective Ingredient & Dose
  • KSM-66® Ashwagandha
  • Natural Ingredients
  • Lab Tested
  • Labdoor Certified Brand
  • Price Per Serving
  • Legion
    KSM-66®
    Ashwagandha

    Legion KSM-66® Ashwagandha
  • 600 mg
    per serving
  • true
  • 600 mg
    per serving
  • true
  • true
  • true
  • $
  • GNC Herbal Plus
    Ashwagandha

    GNC Herbal Plus Ashwagandha
  • 600 mg
    per serving
  • true
  • 600 mg
    per serving
  • true
  • questionable
  • false
  • $1.00
  • NOW Foods
    Ashwagandha

    NOW Foods Ashwagandha
  • 450 mg
    per serving
  • true
  • false
  • true
  • questionable
  • false
  • $0.09
  • Momentous
    Ashwagandha

    Momentous Ashwagandha
  • 300 mg
    per serving
  • true
  • false
  • true
  • questionable
  • false
  • $0.38

The #1 brand of all-natural sports supplements.

Over 4,000,000 bottles sold to over 800,000 customers who have left us over 45,000 5-star reviews.

Natural Ingredients
Natural Ingredients

KSM-66® Ashwagandha is naturally sourced from plants and animals and contains no artificial or synthetic substances of any kind.

Science-Backed Ingredients
Science-Backed Ingredients

The active ingredient in KSM-66® Ashwagandha is backed by published scientific studies that show benefits in healthy humans.

Clinically Effective Doses
Clinically Effective Ingredients & Doses

The ingredient in KSM-66® Ashwagandha is included at a clinically effective level, which is the exact amount shown to be safe and effective in peer-reviewed scientific research.

Lab Tested
Third-Party Lab Tested

KSM-66® Ashwagandha is tested by third-party labs for heavy metals, microbes, allergens, and other contaminants to ensure it meets FDA purity standards.

Made in USA
Made in USA with Globally Sourced Ingredients

KSM-66® Ashwagandha is proudly made in America in NSF-certified and FDA-inspected facilities in accordance with the Current Good Manufacturing Practice (cGMP) regulations.

100% Money-Back-Guarantee
"No Return Necessary"
Money-Back Guarantee

If you don't absolutely love KSM-66® Ashwagandha, you get a prompt and courteous refund. No forms or returns necessary.

Trusted by scientists, doctors, and everyday fitness folk alike.

Previous
  • Dr. Spencer Nadolsky, MD

    Board-Certified Family Medicine Physician, a Diplomate of the American Board of Obesity Medicine, and Legion Advisory Board Member

    "There are a lot of sleazy supplement companies out there, but Legion is not one of them. Their products are free of fillers and inactive ingredients and they take the time (and money) to test them with independent labs to ensure you're getting what you pay for."

  • Menno Henselmans, MS

    Founder of Bayesian Bodybuilding, Published Scientist, Physique Coach, and Legion Advisory Board Member

    "Legion consults with nutrition experts to make honest, science-based products and then proves they're genuine with independent lab work. That's how all supplement companies should operate."

  • Dr. Bill Campbell, PhD

    Professor of Exercise Science at University of South Florida and Legion Advisory Board Member

    "Legion is science-based at its core. All of their products contain doses proven to be effective by scientific studies, and they fund new research. They don't just want to sell you supplements—they want to change the supplement industry for the better."

  • James Krieger, MS

    Published Scientist, Author, and Speaker

    "There are three reasons I like Legion. First, they use ingredients backed by independent, peer-reviewed scientific studies. Second, the quality of their supplements exceeds many in the industry and you know you’re getting what’s on the label. Third, Mike Matthews is a solid evidence-based guy who doesn’t over-hype."

  • Chris Barakat, MS

    Published Scientist and Physique Coach

    "I've been involved in the supplement industry for over a decade now, and I can tell you that Legion is the ONLY company doing EVERYTHING right! They make effective products that are backed by scientific evidence, properly dose all of their ingredients, source every ingredient from the highest-quality sources, and are transparent about exactly what goes in each and every product."

  • Kurtis Frank

    Co-Founder and Former Lead Researcher & Writer of Examine.com

    "With Legion, you really do get what you pay for. Each and every product is packed with effective doses of effective ingredients, and what’s on the label is what's actually in the bottle."

  • Jordan Syatt

    Strength and Nutrition Coach

    "Legion is a tremendous company run by people I trust and respect. The quality of their supplements is second to no one. And while I don’t use many supplements, the only ones I do come from Legion."

  • Sal Di Stefano, Justin Andrews, and Adam Schafer

    Hosts of The Mind Pump Podcast

    "When it comes to quality and integrity, Legion is among the best. Their products only include ingredients that are backed by research and in doses that are proven to be effective in scientific studies."

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Frequently Asked Questions

How do I use KSM-66® Ashwagandha?
What makes KSM-66® Ashwagandha different from other KSM-66® Ashwagandha supplements on the market?
Can I take KSM-66® Ashwagandha with other Legion supplements?
A supplement I take already contains ashwagandha. Can I benefit from KSM-66® Ashwagandha?
How much ashwagandha should I take per day? How much is too much?
What type of effects should I notice?
Are there any side effects of KSM-66® Ashwagandha?
Can KSM-66® Ashwagandha be taken while pregnant or breastfeeding?
Can KSM-66® Ashwagandha be taken with medication?
Is KSM-66® Ashwagandha gluten-free? Soy-free? Dairy-free?
Is KSM-66® Ashwagandha vegetarian or vegan friendly?
What does the Prop65 warning on the label mean?

+References

1. Effects of Withania somnifera (Ashwagandha) on Stress and the Stress- Related Neuropsychiatric Disorders Anxiety, Depression, and Insomnia.

Speers AB, Cabey KA, Soumyanath A, Wright KM. Curr Neuropharmacol. 2021;19(9):1468-1495. doi:10.2174/1570159X19666210712151556.

2. Can Ashwagandha Benefit the Endocrine System?-A Review.

Wiciński M, Fajkiel-Madajczyk A, Kurant Z, et al. Int J Mol Sci. 2023;24(22):16513. Published 2023 Nov 20. doi:10.3390/ijms242216513.

8. Effects of Withania somnifera (Ashwagandha) on Stress and the Stress- Related Neuropsychiatric Disorders Anxiety, Depression, and Insomnia.

Speers AB, Cabey KA, Soumyanath A, Wright KM. Curr Neuropharmacol. 2021;19(9):1468-1495. doi:10.2174/1570159X19666210712151556.

9. Can Ashwagandha Benefit the Endocrine System?-A Review.

Wiciński M, Fajkiel-Madajczyk A, Kurant Z, et al. Int J Mol Sci. 2023;24(22):16513. Published 2023 Nov 20. doi:10.3390/ijms242216513.

10. Naturopathic care for anxiety: a randomized controlled trial ISRCTN78958974.

Cooley K, Szczurko O, Perri D, et al. PLoS One. 2009;4(8):e6628. Published 2009 Aug 31.

11. Effects of Ashwagandha (Withania somnifera) on Physical Performance: Systematic Review and Bayesian Meta-Analysis.

Bonilla DA, Moreno Y, Gho C, Petro JL, Odriozola-Martínez A, Kreider RB. J Funct Morphol Kinesiol. 2021;6(1):20. Published 2021 Feb 11. doi:10.3390/jfmk6010020.

12. Clinical Studies – KSM-66.

https://ksm66ashwagandhaa.com/clinical-studies/. Accessed June 30, 2024.

13. Examining the effect of Withania somnifera supplementation on muscle strength and recovery: a randomized controlled trial.

Wankhede S, Langade D, Joshi K, Sinha SR, Bhattacharyya S. Cureus. J Ayurveda Integr Med. 2012;3(4):209-214. doi:10.4103/0975-9476.104444.

14. Effects of eight-week supplementation of Ashwagandha on cardiorespiratory endurance in elite Indian cyclists.

Shenoy S, Chaskar U, Sandhu JS, Paadhi MM. Nutrition. 2022;103-104:111791. doi:10.1016/j.nut.2022.111791.

15. Effects of Ashwagandha (Withania somnifera) on Physical Performance: Systematic Review and Bayesian Meta-Analysis.

Bonilla DA, Moreno Y, Gho C, Petro JL, Odriozola-Martínez A, Kreider RB. J Funct Morphol Kinesiol. 2021;6(1):20. Published 2021 Feb 11. doi:10.3390/jfmk6010020.

16. Effects of Ashwagandha (Withania somnifera) on VO2max: A Systematic Review and Meta-Analysis.

Pérez-Gómez J, Villafaina S, Adsuar JC, Merellano-Navarro E, Collado-Mateo D. Nutrients. 2020;12(4):1119. Published 2020 Apr 17. doi:10.3390/nu12041119.

17. A double-blind, placebo-controlled evaluation of the anxiolytic efficacy of an ethanolic extract of withania somnifera.

Andrade C, Aswath A, Chaturvedi SK, Srinivasa M, Raguram R. Indian J Psychiatry. 2000;42(3):295-301.

18. Naturopathic care for anxiety: a randomized controlled trial ISRCTN78958974.

Cooley K, Szczurko O, Perri D, et al. PLoS One. 2009;4(8):e6628. Published 2009 Aug 31. doi:10.1371/journal.pone.0006628.

20. Effects of Withania somnifera (Ashwagandha) on Stress and the Stress- Related Neuropsychiatric Disorders Anxiety, Depression, and Insomnia.

Speers AB, Cabey KA, Soumyanath A, Wright KM. Curr Neuropharmacol. 2021;19(9):1468-1495. doi:10.2174/1570159X19666210712151556.

22. Augmentation and proliferation of T lymphocytes and Th-1 cytokines by Withania somnifera in stressed mice.

Khan B, Ahmad SF, Bani S, et al. Int Immunopharmacol. 2006;6(9):1394-1403.

24. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults.

Chandrasekhar K, Kapoor J, Anishetty S. Life Sci. Indian J Psychol Med. 2012;34(3):255-262. doi:10.4103/0253-7176.106022.

25. Adaptogenic and Anxiolytic Effects of Ashwagandha Root Extract in Healthy Adults: A Double-blind, Randomized, Placebo-controlled Clinical Study.

Salve J, Pate S, Debnath K, Langade D. Cureus. 2019;11(12):e6466. Published 2019 Dec 25. doi:10.7759/cureus.6466.

26. Potential clinical applications of Ashwagandha (Withania somnifera) in medicine and neuropsychiatry.

D'Cruz M, Andrade C. Expert Rev Clin Pharmacol. 2022;15(9):1067-1080.

27. Effect of Ashwagandha (Withania somnifera) extract on sleep: A systematic review and meta-analysis.

Cheah KL, Norhayati MN, Husniati Yaacob L, Abdul Rahman R. PLoS One. 2021;16(9):e0257843. Published 2021 Sep 24. doi:10.1371/journal.pone.0257843.

28. Potential clinical applications of Ashwagandha (Withania somnifera) in medicine and neuropsychiatry.

D'Cruz M, Andrade C. Expert Rev Clin Pharmacol. 2022;15(9):1067-1080. doi:10.1080/17512433.2022.2121699.

29. Protective role of Ashwagandha leaf extract and its component withanone on scopolamine-induced changes in the brain and brain-derived cells.

Konar A, Shah N, Singh R, et al. PLoS One. 2011;6(11):e27265. doi:10.1371/journal.pone.0027265.

30. Clinical Evaluation of the Spermatogenic Activity of the Root Extract of Ashwagandha (Withania somnifera) in Oligospermic Males: A Pilot Study.

Ambiye VR, Langade D, Dongre S, Aptikar P, Kulkarni M, Dongre A. Evid Based Complement Alternat Med. 2013;2013:571420. doi:10.1155/2013/571420.

31. In vivo effects of Ashwagandha (Withania somnifera) extract on the activation of lymphocytes.

Mikolai J, Erlandsen A, Murison A, et al. J Altern Complement Med. 2009;15(4):423-430. doi:10.1089/acm.2008.0215.

32. Toxicological significance of azo dye metabolism by human intestinal microbiota.

Feng J, Cerniglia CE, Chen H. Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, AR , USA. Front Biosci (Elite Ed). 2012 Jan 1;4:568-86.

33. Artificial food dyes and attention deficit hyperactivity disorder.

Kanarek RB. Department of Psychology, Tufts University, Medford, Massachusetts, USA. Nutr Rev. 2011 Jul;69(7):385-91.

34. Meta-analysis of attention-deficit/hyperactivity disorder or attention-deficit/hyperactivity disorder symptoms, restriction diet, and synthetic food color additives.

Nigg JT, Lewis K, Edinger T, Falk M. Oregon Health and Science University, Portland, OR, USA. J Am Acad Child Adolesc Psychiatry. 2012 Jan;51(1):86-97.e8.

35. Food additives and hyperactive behaviour in 3-year-old and 8/9-year-old children in the community: a randomised, double-blinded, placebo-controlled trial.

McCann D, Barrett A, Cooper A, Crumpler D, Dalen L, Grimshaw K, Kitchin E, Lok K, Porteous L, Prince E, Sonuga-Barke E, Warner JO, Stevenson J. School of Psychology, Department of Child Health, University of Southampton, Southampton, UK. Lancet. 2007 Nov 3;370(9598):1560-7.

36. Effect of food azo dye tartrazine on learning and memory functions in mice and rats, and the possible mechanisms involved.

Gao Y, Li C, Shen J, Yin H, An X, Jin H. Scientific and Technological College of Chemistry and Biology, Yantai Univ., Yantai, PR China. J Food Sci. 2011 Aug;76(6):T125-9.