What do the states mean?+
- Solid: well studied, and it works.
- Half-there: the science is still forming.
- A ghost: almost no real studies.
- Hollow: well studied, and it does not work.
- A cord: the pair itself has been tested together.
- Air: nobody has ever tested this pair.
The full scoring method: How we score
Ashwagandha benefits: where the science stands
For stress and anxiety: yes.
Stress and anxiety are what most people take ashwagandha for, and the strongest evidence says it helps (two combined reviews covering 31 trials, plus two trials, 191 people in all). As of August 2026, the verdicts on this page rest on evidence from 94 trials, drawn from the strongest research among the 136 papers on PubMed that mention ashwagandha. Every claim is checked below.
136 papers on PubMed · evidence from 94 trials · 2 cautions
250 to 600 mg · evening if taken for sleep
Claim by claim
- Stress and anxietyWell studied, and it works. The biggest review covered 22 trials.
- EnduranceWell studied, and it works. The biggest review covered 13 trials.
- Memory and focusThe science is still forming. Results lean positive, but there is not much yet.
- MoodThe science is still forming. Results lean positive, but there is not much yet.
See 2 more scored claims+
- SleepWell studied, and it works. The biggest review covered 5 trials.
- Testosterone and libidoAlmost no real studies. What exists leans positive.
The best time to take ashwagandha
Doses in trials ranged 125-600 mg of standardized extract. Doses shown are common label doses, not a prescription.
Pairs people ask about
The twelve sources we read
- 2019Randomized trial · 60 people · small benefit for stress and anxietysource
- 2020Meta-analysis · pools 5 trials · small benefit for memory and focussource
- 2020Meta-analysis · pools 30 trials · small benefit for moodsource
- 2021Meta-analysis · pools 5 trials, 400 people · small benefit for sleepsource
- 2021Randomized trial · 80 people · small benefit for sleepsource
- 2023Meta-analysis · pools 9 trials · moderate benefit for stress and anxietysource
- 2023Randomized trial · 80 people · moderate benefit for endurancesource
- 2024Randomized trial · 131 people · small benefit for stress and anxietysource
- 2024Meta-analysis · pools 3 trials · benefit for testosterone and libidosource
- 2025Randomized trial · 40 people · moderate benefit for memory and focussource
- 2026Meta-analysis · pools 22 trials · large benefit for stress and anxietysource
- 2026Meta-analysis · pools 13 trials, 599 people · small benefit for endurancesource
Chosen as the strongest evidence out of 136 papers on PubMed. Every row links to its paper.
Fair questions
Does ashwagandha work?+
For stress and anxiety, yes. The biggest review covered 22 trials.
Is ashwagandha safe?+
2 cautions are recorded. The first: Ashwagandha reads consistently positive here, but its literature is small (136 human supplementation papers, against 4,000 for magnesium) and most trials use proprietary standardised extracts supplied by their manufacturers. The direction of the evidence is real. Its independence is not established.
Why only 12 sources, when PubMed lists 136?+
The 136 is every paper that mentions ashwagandha in any way: animal studies, blood measurements, papers where it is a side note. The strongest sources are combined reviews, and each one already gathers every trial its authors could find. Our 12 cover 94 trials between them, and every one is linked above. Both counts are measured, not estimated.