Substrate ·evidence-based
interventions / Ashwagandha

Ashwagandha: what the evidence actually shows

surging  ashwagandha — attention is ahead of the evidence

Reviewer and governance status are shown on each atomic claim below.

What it is

Ashwagandha is tracked as a health intervention in this evidence graph. Also known as: Withania somnifera, withania, somnifera, Indian ginseng.

Studied forms and doses

No form-specific catalog record is available. This does not mean all forms are equivalent.

Mechanisms

Mechanistic plausibility is context, not proof that a clinical outcome improves.

No structured mechanism is recorded.

⚠ Safety in context

Products and verification

No product label snapshot is mapped in this released catalog. Ingredient evidence does not establish any bottle’s identity, potency, purity, availability, or value.

Evidence by outcome

strengthgrade Bmoderate certainty— Ashwagandha supplementation was more efficacious than placebo for improving strength/power variables in healthy individuals.
energy / fatiguegrade Bmoderate certainty— Ashwagandha supplementation was more efficacious than placebo for improving fatigue/recovery variables in healthy individuals.
moodgrade Bmoderate certainty— Meta-analysis of 22 studies: ashwagandha supplementation significantly reduced stress, depression, and anxiety scores versus control, with a dose-response relationship observed for stress. One of the more consistent mental-health signals in the ashwagandha literature, though study quality and dosing vary.
sleepgrade Clow certainty— small, early-stage effect on sleep
stressgrade Clow certainty— small reduction in perceived stress in short trials
cognitiongrade Clow certainty— preliminary improvements in memory/executive function; small trials
strengthgrade Clow certainty— A single 8-week randomized controlled trial in men doing resistance training found greater gains in muscle strength and size, and better recovery, with ashwagandha versus placebo. One small trial cannot anchor a strong grade; independent replication is needed.
blood sugargrade Clow certainty— Systematic review and meta-analysis of Withania somnifera (ashwagandha) in diabetes: pooled data suggest a possible glucose-lowering effect, but the authors conclude the anti-diabetic profile is not yet established and call for larger, longer randomized trials measuring blood glucose, HbA1c and insulin. Signal, not confirmation.
testosterone / hormone levelsgrade Dvery-low certainty— Systematic review of 4 trials (only 1 RCT, mostly uncontrolled before-after): testosterone up 17%, LH up 34%, semen concentration +13.57 million/ml; authors call their own evidence "too limited to provide sufficiently robust evidence".
immune functiongrade Dvery-low certainty— Review: ashwagandha shows immunomodulatory effects in mechanistic and early studies, but clinical evidence that it meaningfully improves immune outcomes in people is preliminary.

People say · Evidence shows

“Ashwagandha balances cortisol”

aheadlargemechanistic speculation

What it probably doesn't do

Grade history

Re-review cadence: every 12 months (Grade A/B) · next scheduled by · methodology v1.

By outcome — the money pages

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More

sources: PMID:33670194 · PMID:41644067 · PMID:31728244 · PMID:25405876 · PMID:42199854 · PMID:26609282 · PMID:31975514 · PMID:30466985 · PMID:36909188

Cite this page

Citation is encouraged. The proposed reuse license is CC-BY-4.0; status: pending-governance-ratification.

Plain-text citation
Substrate. Ashwagandha: what the evidence actually shows. https://evidencebased.info/interventions/ashwagandha. Updated 2026-07-16.
BibTeX
@misc{substrate_rventionsashwagandha,
  author = {Substrate editorial},
  title  = {Ashwagandha: what the evidence actually shows},
  year   = {2026},
  url    = {https://evidencebased.info/interventions/ashwagandha},
  note   = {evidencebased.info}
}