Claim deep dive·Moderate evidence·Updated July 13, 2026
Evidence review: Ashwagandha reduces stress and anxiety symptoms
A 2022 systematic review and meta-analysis (Akhgarjand et al., 12 RCTs, n=1,002) found significant reductions in stress and anxiety vs placebo at 300 to 600 mg/day.
The bottom line.
The strongest studies.
Sorted by study tier (meta-analyses first, then RCTs, then reviews) and recency. Every entry links to PubMed by PMID, and every citation on this page points here.
Meta-analyses & systematic reviews
2- 1Effects of Withania somnifera on Cortisol Levels in Stressed Human Subjects: A Systematic ReviewSource linkedPMIDDella Porta M, Maier JA, Cazzola R · Nutrients · 2023
- 2Does Ashwagandha supplementation have a beneficial effect on the management of anxiety and stress? A systematic review and meta-analysis of randomized controlled trialsSource linkedPMIDAkhgarjand C et al. · Phytother Res · 2022
12 RCTs with 1,002 participants showed ashwagandha significantly reduced anxiety and stress at 300-600 mg/day
Randomized controlled trials
4- 3A standardized Ashwagandha root extract alleviates stress, anxiety, and improves quality of life in healthy adults by modulating stress hormones: Results from a randomized, double-blind, placebo-controlled study.Source linkedPMIDMajeed M, Nagabhushanam K, Mundkur L · Medicine · 2023
Standardized ashwagandha root extract significantly reduced cortisol levels and perceived stress while improving quality of life scores in healthy adults.
- 4Exploring the efficacy and safety of a novel standardized ashwagandha (Withania somnifera) root extract (Witholytin®) in adults experiencing high stress and fatigue in a randomized, double-blind, placebo-controlled trialSource linkedPMIDSmith SJ, Lopresti AL, Fairchild TJ · Journal of psychopharmacology (Oxford, England) · 2023
- 5Efficacy and safety of ashwagandha root extract on cognitive functions in healthy, stressed adults: a randomized, double-blind studySource linkedPMIDChoudhary D, Bhatt S, Banerjee S · J Diet Suppl · 2017
Ashwagandha improved immediate and general memory, executive function, and attention
- 6A 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 adultsSource linkedPMIDChandrasekhar K et al. · Indian J Psychol Med · 2012
300 mg twice daily for 60 days significantly reduced serum cortisol levels compared to placebo
What pushes back.
Caveats, null findings, and methodological limits that hold the tier where it is.
What the evidence supports.
What we recommend
300 to 600 mg/day standardized root extract for 4 to 12 weeks of high-stress periods. Not a substitute for therapy or prescribed treatment in clinical anxiety disorders. 2
Tier criteria: /methodology/evidence-tiers. Sourcing standards: /methodology/interactions.
Common questions.
Quick answers drawn from the verdict, evidence, and recommendation above.
Does the evidence support the claim that ashwagandha reduces stress and anxiety symptoms?
A 2022 systematic review and meta-analysis (Akhgarjand et al., 12 RCTs, n=1,002) found significant reductions in stress and anxiety vs placebo at 300 to 600 mg/day.
How strong is the evidence behind Ashwagandha for this claim?
NutriStack rates this as Moderate evidence, meaning several aligned RCTs or one large RCT plus supporting reviews. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
What contrary evidence or caveats apply?
Trials are short and predominantly conducted in India. Heterogeneous extracts (root vs leaf, KSM-66 vs Sensoril vs generic) limit direct comparison.
What does NutriStack recommend?
300 to 600 mg/day standardized root extract for 4 to 12 weeks of high-stress periods. Not a substitute for therapy or prescribed treatment in clinical anxiety disorders.
Selected claims, opened up
This is how NutriStack presents an evidence review.
Each published claim review shows its verdict, attached studies, contrary evidence, dose context, and limits. Coverage is selective rather than a claim that every database assertion has received the same review.