Ashwagandha has more human trials behind it than most herbal supplements. That’s the good news. The less-advertised news is that those trials are mostly small and short, and the pooled results aren’t as clean as marketing suggests.
Written by Vita Globe Editorial Team | Reviewed against meta-analyses, randomized controlled trials and NIH guidance
Does ashwagandha actually work?
For everyday stress and sleep, probably somewhat. A meta-analysis of randomized trials found lower stress and anxiety scores than placebo[1], and another found a small but significant sleep benefit[2]. But a 2025 meta-analysis found that while cortisol fell consistently, self-reported stress did not differ significantly from placebo[3].
Caveat: Most trials are small, last 6–12 weeks and tested specific concentrated extracts, so results may not apply to every product.
Sources: Akhgarjand 2022 · Cheah 2021 · Albalawi 2025 · Verified 2026-09-27
In this article
What do the best-known trials show?
Two stress trials come up again and again:
- Chandrasekhar 2012. Adults with chronic stress took 300 mg of root extract twice daily for 60 days. They reported lower stress than the placebo group and had lower serum cortisol[4].
- Salve 2019. Sixty healthy adults took 250 mg, 600 mg or placebo daily for 8 weeks. Both doses lowered perceived stress and cortisol vs. placebo; the 600 mg group also saw anxiety scores and sleep quality improve more[5].
For sleep, trials have been similarly small: the five pooled in one meta-analysis included 400 people in total[2].
Each of these is encouraging. Each is also small, which is why pooled analyses matter.
What happens when you pool the trials?
Meta-analyses combine similar trials to get a clearer signal. Here is what three of them found:
| Review | Focus | Finding |
|---|---|---|
| Akhgarjand 2022 | Stress and anxiety | Lower stress and anxiety scores vs. placebo |
| Cheah 2021 | Sleep (5 trials, 400 people) | Small but significant improvement, clearest in insomnia, at 600 mg+ and 8+ weeks |
| Albalawi 2025 | Cortisol and perceived stress | Cortisol lower; perceived stress not significantly different |
The first two support a real, modest effect[1][2]. The third is a useful reality check: across seven cortisol studies and six perceived-stress studies, the biological marker moved but how stressed people said they felt did not change significantly compared with placebo[3]. The authors suggest longer trials and more diverse participants are needed.
Why is the evidence still considered limited?
A detailed 2021 review of ashwagandha’s effects on stress, anxiety, depression and insomnia concluded that the findings are promising but that larger, longer and more rigorous trials are needed[6]. A few recurring issues:
- Small samples. Many trials enrolled fewer than 100 people.
- Short duration. Most lasted 6–12 weeks, so we know little about long-term use.
- Different extracts. Trials tested several different branded extracts at different doses, which makes results hard to pool and hard to apply to any one product.
- Mixed outcomes. As the 2025 analysis showed, lab markers and how people feel don’t always line up[3].
That’s why the National Center for Complementary and Integrative Health says some preparations may help with insomnia and stress, while the evidence on anxiety is unclear[7].
So does ashwagandha work for you?
Reasonable expectations look like this: a modest, gradual easing of everyday stress and possibly better sleep over several weeks, if you take an adequately dosed product consistently. It is not a sedative, not a fix for an anxiety disorder, and not proven for memory, weight loss or immunity. Our breakdown of what ashwagandha is good for rates each use.
It also helps to know what would change the picture. Larger trials run by independent researchers, studies lasting six months or more, and head-to-head comparisons of different extracts would all make the evidence much stronger. Until then, the fairest description is “promising for stress and sleep, with real limits.” If you try it, give it a fair window of about 8 weeks, keep other habits steady so you can tell whether anything changed, and stop if you notice side effects. See how long it takes to work for a realistic timeline.
The honest summary
- Yes, for everyday stress and sleep there is a modest, real signal in randomized trials.
- No, the evidence is not as strong as marketing implies; self-reported stress results are mixed.
- Most positive results come from 250–600 mg a day of standardized extract for 8+ weeks.
- Talk to your provider first if you take medication or have a thyroid, liver or autoimmune condition.
Our option
Vita Globe Ashwagandha 25mg Gummies (60 count)
25 mg of ashwagandha in a naturally flavored tart-cherry gummy, one a day, in a 60-count bottle. Tested by an independent third-party lab. It’s a gentle, low-dose way to build a daily ashwagandha habit. To be clear, 25 mg is well below the doses of standardized extract used in the trials above, so we don’t claim it replicates those results.*
Frequently asked questions
Is ashwagandha a placebo?
No. In randomized trials it outperformed placebo on several measures, including cortisol[1][3]. The effects are modest, though, and self-reported stress results are mixed[3].
Does ashwagandha lower cortisol?
Across trials, yes. A 2025 meta-analysis found a statistically significant reduction in cortisol compared with placebo[3].
Why doesn’t ashwagandha work for me?
Common reasons include a low or different extract dose, too short a trial (most studies ran 6–8 weeks), or simply individual variation. See how long it takes and how much to take.
Is ashwagandha backed by science?
Partly. It has more human trials than most herbs, but reviewers still call for larger, longer studies[6].
Sources
- Akhgarjand C, Asoudeh F, Bagheri A, et al. Does ashwagandha supplementation have a beneficial effect on the management of anxiety and stress? A systematic review and meta-analysis of randomized controlled trials. Phytother Res. 2022;36(11):4115-4124. doi:10.1002/ptr.7598
- Cheah KL, Norhayati MN, Husniati Yaacob L, Abdul Rahman R. Effect of ashwagandha (Withania somnifera) extract on sleep: a systematic review and meta-analysis. PLoS One. 2021;16(9):e0257843. doi:10.1371/journal.pone.0257843
- Albalawi AA. Dual impact of ashwagandha: significant cortisol reduction but no effects on perceived stress. A systematic review and meta-analysis. Nutr Health. 2025;31(4):1395-1408. doi:10.1177/02601060251363647
- Chandrasekhar K, Kapoor J, Anishetty S. 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. Indian J Psychol Med. 2012;34(3):255-262. doi:10.4103/0253-7176.106022
- Salve J, Pate S, Debnath K, Langade D. Adaptogenic and anxiolytic effects of ashwagandha root extract in healthy adults: a double-blind, randomized, placebo-controlled clinical study. Cureus. 2019;11(12):e6466. doi:10.7759/cureus.6466
- Speers AB, Cabey KA, Soumyanath A, Wright KM. Effects of Withania somnifera (ashwagandha) on stress and the stress-related neuropsychiatric disorders anxiety, depression, and insomnia. Curr Neuropharmacol. 2021;19(9):1468-1495. doi:10.2174/1570159X19666210712151556
- National Center for Complementary and Integrative Health. Ashwagandha: Usefulness and Safety. Updated March 2023. https://www.nccih.nih.gov/health/ashwagandha
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or caring for a child.
