Ashwagandha
Best for
Reduce daily stress
Large effect, needs confirmation for 4–13 weeks · 2 meta-analyses , n=2.3k
53 papers · 16 claims · 182 outcomes scored · 15 positive
Outcomes
What ashwagandha actually does, by outcome
Each row is one outcome with effect size, evidence base, the dose that worked in trials, and time to first effect. Magnitude tiers come from native-unit MCID where available, Cohen's d otherwise.
Everyday pressure stops running your nervous system hot.
Fewer days where health problems dictate what you can and cannot do.
Less of that heavy, worn-out feeling that makes simple tasks feel like a chore.
Fewer wake-ups and more unbroken hours of real rest.
Shrinks the gap between hitting the pillow and actually sleeping.
Higher one-rep max, stronger grip, and more force from every muscle group.
Good days come more often and bad ones feel less heavy.
Deeper, less interrupted nights that leave you recharged by morning.
The background hum of worry that colors everything gets quieter.
Quiets the health worries and body tension that build with age.
Quiets the overthinking that hijacks execution right before you compete.
Names, conversations, faces, and details stick instead of dissolving.
Heart rate, sweating, and tension spike less under pressure.
The background noise of worry, irritability, and low mood gets quieter.
Organize priorities, switch tasks, and catch mistakes more easily.
Conversations and everyday interactions feel more natural and fluid.
| Outcome | Effect | Evidence | Dose | Weeks | Rank |
|---|---|---|---|---|---|
| Reduce daily stress Large effect, needs confirmation | | 18 meta-analyses n=2.3k Meta-analyzed | 0–12000 mg | 4–13 wk | #2/41 |
| Improve everyday quality of life Likely strong benefit | | 15 meta-analyses n=1.0k Meta-analyzed | 1–600 mg | 8–13 wk | #1/61 |
| Reduce everyday fatigue Large effect, needs confirmation | | 6 RCTs n=390 | 125–700 mg | 8–12 wk | #4/44 |
| Stay asleep through the night Likely strong benefit | | 2 meta-analyses n=339 Meta-analyzed | 120–600 mg | 10 wk | #1/15 |
| Fall asleep faster Likely strong benefit | | 2 meta-analyses n=339 Meta-analyzed | 120–600 mg | 10 wk | #2/19 |
| Build stronger muscles Large effect, needs confirmation | | 7 meta-analyses n=242 Meta-analyzed | 240–600 mg | 4–12 wk | #8/38 |
| Lift and steady your mood Large effect, needs confirmation | | 2 RCTs n=90 | 125–600 mg | 9–12 wk | #2/20 |
| Improve overall sleep quality Proven modest benefit | | 11 meta-analyses n=1.5k Meta-analyzed | 10–12000 mg | 4–13 wk | #2/37 |
| Lower day-to-day anxiety Faint early signal | | 12 meta-analyses n=1.4k Meta-analyzed | 10–12000 mg | 8–12 wk | #3/48 |
| Ease anxiety in older adults Faint early signal | | 12 meta-analyses n=1.4k Meta-analyzed | 10–12000 mg | 8–12 wk | #3/45 |
| Reduce pre-competition anxiety Faint early signal | | 12 meta-analyses n=1.4k Meta-analyzed | 10–12000 mg | 8–12 wk | #3/45 |
| Strengthen your memory Likely modest benefit | | 5 RCTs n=233 | 225–500 mg | 4–13 wk | #2/42 |
| Ease your body's stress response Faint early signal | | 1 RCT n=90 | 125 mg | 12 wk | #1/2 |
| Reduce emotional overwhelm Faint early signal | | 1 RCT n=60 | 240 mg | 9 wk | #4/7 |
| Strengthen planning and mental control Not enough research | | 3 RCTs n=79 | 250–1000 mg | 2–8 wk | #7/28 |
| Sharpen social processing Not enough research | | 1 RCT n=53 | 250–500 mg | 8 wk | — |
Recommended Ashwagandha products
Real products that dose Ashwagandha where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.
-
Nootropics Depot
Ashwagandha Extract 250 mg
Well dosed 500 mg/day A formulaBrand audit 87/100
-
Nootropics Depot
Ashwagandha Capsules 500 mg
Well dosed 500 mg/day A formulaBrand audit 87/100
-
Seeking Health
Ashwagandha Extract
Well dosed 420 mg/day A formulaBrand audit 85/100
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Pure Encapsulations
Ashwagandha
Well dosed 500 mg/day A formulaBrand audit 78/100
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Double Wood Supplements
Ashwagandha 500 mg
Well dosed 500 mg/day A formulaBrand audit 75/100
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Dr. Mercola
Organic Ashwagandha
Well dosed 800 mg/day A formulaBrand audit 63/100
Chosen for adequate Ashwagandha dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.
Risk profile
Adverse events and known drug interactions
Safety events
Drug interactions
Co-studied with
Supplements that share evidence with ashwagandha
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Vitaminb9 20 shared outcomes · d=0.87 -
Piperine 13 shared outcomes · d=0.57 -
Lemonbalm 13 shared outcomes · d=0.85 -
Vitaminb6 13 shared outcomes · d=0.85 -
Vitaminb12 7 shared outcomes · d=0.90 -
Iron 7 shared outcomes · d=0.90 -
Terminalia 6 shared outcomes · d=1.44 - Blackpepper 6 shared outcomes · d=1.44
-
Pepper 6 shared outcomes · d=1.44 -
Ginger 6 shared outcomes · d=1.44 -
Tryptophan 4 shared outcomes · d=0.61
Sources
- 1. 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. (2012) ↑
- 2. Randomized placebo-controlled adjunctive study of an extract of withania somnifera for cognitive dysfunction in bipolar disorder. (2013) ↑
- 3. An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract: A randomized, double-blind, placebo-controlled study. (2019) ↑
- 4. Efficacy and Safety of Ashwagandha (Withania somnifera) Root Extract in Insomnia and Anxiety: A Double-blind, Randomized, Placebo-controlled Study. (2019) ↑
- 5. Adaptogenic and Anxiolytic Effects of Ashwagandha Root Extract in Healthy Adults: A Double-blind, Randomized, Placebo-controlled Clinical Study. (2019) ↑
- 6. Effect of Ashwagandha (Withania somnifera) extract on sleep: A systematic review and meta-analysis. (2021) ↑
- 7. Efficacy and Safety of Ashwagandha (Withania somnifera) Root Extract for Improvement of Sexual Health in Healthy Women: A Prospective, Randomized, Placebo-Controlled Study. (2022) ↑
- 8. A 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. (2023) ↑
- 9. Effects of Withania somnifera Extract in Chronically Stressed Adults: A Randomized Controlled Trial. (2024) ↑
- 10. Shoden promotes Relief from stress and anxiety: A randomized, double-blind, placebo-controlled study on healthy subjects with high stress levels. (2024) ↑
Generated August 14, 2026
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