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Ashwagandha

What does the research say about Ashwagandha?

2 health outcomes synthesised

Research on Ashwagandha has investigated its effects on 2 health outcomes, including sleep quality and anxiety. The strongest evidence, based on 3 studies, supports improved sleep quality with moderate evidence strength. Effective doses in studies typically range from 120 to 1000 mg/day, with benefits observed across healthy individuals and those with stress-related or sleep disorders.

Strongest evidence The most robust evidence supports Ashwagandha for improving sleep quality. In 3 studies (moderate evidence strength), all reported beneficial effects, with effect sizes ranging from small to large. Doses used were 120–1000 mg/day, and the most-studied population included individuals with stress-related conditions or insomnia. A meta-analysis with 254 participants found a small effect, while a systematic review with 590 participants found a moderate effect.

Mixed or weaker evidence For reducing anxiety, 3 studies (low evidence strength) all showed beneficial effects, with effect sizes ranging from moderate to large. However, the evidence base is small and considered preliminary. Two of the three studies are reviews without original patient-level data, and publication bias may overstate benefits.

Effective dose patterns Across both outcomes, effective doses consistently ranged from 120 to 1000 mg/day, with a median study duration of 56 days (8 weeks). This suggests that typical protocols use daily doses in this range for at least 8 weeks to observe effects.

Population insights Studies included healthy individuals, patients with stress-related or functional disorders, those with anxiety or insomnia, and people with mental disorders. Benefits were observed across these diverse groups, though the small evidence base limits subgroup analysis.

Notable caveats The evidence base for both outcomes is small (only 3 studies each), making conclusions preliminary. Publication bias is a concern, as null results may be underreported. Effect sizes for sleep quality varied substantially, and the wide dose range makes it difficult to pinpoint an optimal dose. Clinical implications should be interpreted with caution.

Frequently asked

  • What is Ashwagandha good for according to research?
    Research on Ashwagandha has focused primarily on two outcomes: improving sleep quality and reducing anxiety. For sleep quality, evidence is moderate and based on 3 studies showing beneficial effects. For anxiety, evidence is low, though all studies report positive effects. Both areas suffer from a small evidence base.
  • What dose of Ashwagandha is typically used in studies?
    Studies on Ashwagandha for sleep and anxiety typically use doses between 120 and 1000 mg per day. The median study duration is 56 days (8 weeks). This wide range makes it difficult to identify an optimal dose, but effects have been observed across this spectrum.
  • Who benefits most from Ashwagandha?
    Populations studied include healthy individuals, patients with stress-related or functional disorders, those with anxiety or insomnia, and people with mental disorders. Benefits appear across these groups, but the small number of studies limits conclusions about which specific population benefits most.
  • Are there caveats or limitations in the research on Ashwagandha?
    Yes, the evidence base is small (only 3 studies per outcome), so conclusions are preliminary. Available evidence is overwhelmingly positive, but publication bias is a concern—null-result studies are less likely to be published. Effect sizes for sleep varied substantially, and dose ranges were wide.
  • Does Ashwagandha help with improved sleep quality?
    Yes, moderate evidence from 3 studies indicates Ashwagandha improves sleep quality, with effect sizes ranging from small to large. A systematic review with 590 participants found a moderate effect, while a meta-analysis with 254 participants found a small effect. Doses used were 120–1000 mg/day.
  • Does Ashwagandha help with reducing anxiety?
    Low evidence from 3 studies suggests Ashwagandha reduces anxiety, with moderate to large effect sizes. Two of the studies are reviews without original patient data, and one is a systematic review with meta-analysis. The evidence is considered preliminary due to the small base and potential publication bias.

Safety profile

4 studies reporting safety data

Across 4 clinical studies reporting safety data on Ashwagandha, no specific adverse events were found to be significantly increased compared to control, and no serious adverse events were flagged. The supplement was generally described as well tolerated in 3 studies, with one additional case report noting a possible cholestatic liver injury in a patient with severe alcohol use disorder taking a testosterone-boosting supplement containing Ashwagandha. Overall, Ashwagandha is associated with a favorable tolerability profile in the available literature, though the evidence is limited.

Caveats: Limited evidence base (4 studies); absence of reported adverse events does not establish long-term safety. Most reports derive from small or short-term studies, and the one case of liver injury was confounded by alcohol use and a multi-ingredient supplement, making causality difficult to determine.

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