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Ashwagandha

Ashwagandha

Best for

Reduce daily stress

Large effect, needs confirmation · 0–12000 mg/day for 4–13 weeks · 2 meta-analyses , n=2.3k

52 papers · 12 claims · 176 outcomes scored · 12 positive

Evidence summary

Evidence summary

Likely strong benefit

Ashwagandha delivers a likely strong benefit for sleep and stress-related quality of life in adults, with the clearest gains in falling asleep faster and staying asleep.

  • Across 2 studies (n=339), ashwagandha improved sleep outcomes, with changes above the threshold for noticeable change.3
  • Ashwagandha has 52 papers and 176 outcomes, with the strongest signals clustered in sleep, stress, and daily quality of life.
  • Most positive trials used standardized root extract for about eight weeks in adults under stress or with insomnia.

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.

Reduce daily stress Large effect, needs confirmation

Everyday pressure stops running your nervous system hot.

18 meta-analyses n=2.3k 0–12000 mg 4–13 wk #2/41
23439798·27055824·32021735·34858513 +14 more
Improve everyday quality of life Likely strong benefit

Fewer days where health problems dictate what you can and cannot do.

15 meta-analyses n=1.0k 1–600 mg 8–13 wk #1/61
32226684·33600918·36447681·36937128 +11 more
Reduce everyday fatigue Large effect, needs confirmation

Less of that heavy, worn-out feeling that makes simple tasks feel like a chore.

6 RCTs n=390 125–700 mg 8–12 wk #3/44
30854916·33600918·35873404·37740662 +2 more
Stay asleep through the night Likely strong benefit

Fewer wake-ups and more unbroken hours of real rest.

2 meta-analyses n=339 120–600 mg 10 wk #1/15
31728244·34559859
Fall asleep faster Likely strong benefit

Shrinks the gap between hitting the pillow and actually sleeping.

2 meta-analyses n=339 120–600 mg 10 wk #2/19
31728244·34559859
Build stronger muscles Large effect, needs confirmation

Higher one-rep max, stronger grip, and more force from every muscle group.

7 meta-analyses n=242 240–600 mg 4–12 wk #8/38
30463324·33670194·38988644·39381480 +3 more
Lift and steady your mood Large effect, needs confirmation

Good days come more often and bad ones feel less heavy.

2 RCTs n=90 125–600 mg 9–12 wk #2/20
23439798·40875185
Improve overall sleep quality Likely modest benefit

Deeper, less interrupted nights that leave you recharged by morning.

11 meta-analyses n=1.5k 10–12000 mg 4–13 wk #3/37
31728244·32021735·32226684·34559859 +7 more
Lower day-to-day anxiety Faint early signal

The background hum of worry that colors everything gets quieter.

11 meta-analyses n=1.3k 10–12000 mg 8–12 wk #3/48
23439798·31517876·31728244·32021735 +7 more
Ease anxiety in older adults Faint early signal

Quiets the health worries and body tension that build with age.

11 meta-analyses n=1.3k 10–12000 mg 8–12 wk #3/45
23439798·31517876·31728244·32021735 +7 more
Reduce pre-competition anxiety Faint early signal

Quiets the overthinking that hijacks execution right before you compete.

11 meta-analyses n=1.3k 10–12000 mg 8–12 wk #3/45
23439798·31517876·31728244·32021735 +7 more
Reduce emotional overwhelm Faint early signal

The background noise of worry, irritability, and low mood gets quieter.

1 RCT n=60 240 mg 9 wk #4/7
31517876

Forms & standardisation

The best human evidence comes from standardized ashwagandha root extract, not vague herb blends or unlabeled powder.123 On the label, look for the extract type and a stated withanolide standardization so you can compare your bottle to the products used in trials instead of guessing.134 If a brand hides the extract details, you lose the one thing that lets research translate into real life.

Risk profile

Adverse events and known drug interactions

Safety events

hepatotoxicity severe
acute-on-chronic liver failure severe
hepatic necrosis severe
drug-induced liver injury (herb-induced liver injury) severe
hepatotoxicity (drug-induced liver injury) severe
adrenal hypofunction (adrenal insufficiency) severe
intrahepatic cholestasis severe
adrenal_insufficiency / HPA axis suppression severe

Drug interactions

Hypnotics And Sedatives major additive
Anxiolytics major additive
Antiepileptics major increases toxicity
Immunosuppressants major decreases concentration
Antineoplastic Agents major increases toxicity
Antidepressants major additive
Morphine moderate increases effect
Paclitaxel moderate decreases effect
Levothyroxine moderate unknown
other moderate decreases concentration

Co-studied with

Supplements that share evidence with ashwagandha

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

Frequently asked

Common questions

Does ashwagandha work better for stress or sleep?

Right now, the cleanest signal sits in sleep: studies show faster sleep onset and fewer nighttime wake-ups, while the stress data looks broader and promising but still less locked-in than the best sleep findings.234

How long does ashwagandha take to work?

Think weeks, not one dramatic first dose. Most positive trials run for about 8-10 weeks, and that pattern repeats across sleep and stress outcomes.1234

What dose of ashwagandha shows up most in studies?

The better-supported protocols usually land around 300-600 mg/day of standardized root extract. 300 mg twice daily is one of the most repeated setups in stress and sleep research.124

Does ashwagandha lower cortisol?

Yes, several stress trials report lower cortisol alongside better stress scores. That fits the bigger picture: ashwagandha seems to calm the body's alarm system rather than just masking how stressed you feel.14

Should you take ashwagandha in the morning or at night?

Use the goal as your clue. Stress studies often split the dose between morning and evening, while sleep-focused protocols usually place it later in the day or at bedtime.12

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Sources

  1. 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. 2. Efficacy and Safety of Ashwagandha (Withania somnifera) Root Extract in Insomnia and Anxiety: A Double-blind, Randomized, Placebo-controlled Study (2019) ↑
  3. 3. Effects of Ashwagandha (Withania somnifera) extract on sleep: a systematic review and meta-analysis (2021) ↑
  4. 4. Adaptogenic and anxiolytic effects of ashwagandha root extract in healthy adults: a double-blind, randomized, placebo-controlled clinical study (2019) ↑
  5. 5. Examining the effect of Withania somnifera supplementation on muscle strength and recovery: a randomized controlled trial (2015) ↑

Generated May 11, 2026

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