Does Ashwagandha help energy / fatigue? (Grade B evidence)
Ashwagandha shows a Grade B benefit for energy / fatigue — moderate-certainty evidence from randomised trials, especially in healthy men and women. Typical studied doses are not specified.
Exact question reviewed
- Population
- healthy men and women
- Intervention
- Ashwagandha
- Comparator
- not reported
- Outcome
- energy / fatigue
- Time horizon
- not reported
Bottom line. Ashwagandha shows a Grade B benefit for energy / fatigue — moderate-certainty evidence from randomised trials, especially in healthy men and women. Typical studied doses are not specified. [1 RCT]
- Direction
- benefit
- Magnitude
- Ashwagandha supplementation was more efficacious than placebo for improving fatigue/recovery variables in healthy individuals.
- Grade
- B
- Certainty
- moderate
- Clinical meaning
- small but potentially useful
- Who it applies to
- healthy men and women
- Dose / form studied
- not reported
- Safety
- moderate_with_ssri
- The one limitation
- Claim-specific limitation details are not available in this public record.
Reviewed · Evidence last changed · Claim clm_ec_pmid:33670194#1 v0
⚠ Safety in context
- moderatewith SSRI: Ashwagandha with an SSRI may carry additive sedative/serotonergic risk; evidence is limited. full interaction →
Grade B / moderate: probably helps, and new studies are unlikely to reverse this — but could shrink the effect size.
Who it works for
Best-studied in healthy men and women.
Evidence
| Study | Design | Role | Cite |
|---|---|---|---|
| Effects of Ashwagandha (Withania somnifera) on Physical Performance: Systematic Review and Bayesian Meta-Analysis. | peer-reviewed | not classified | PMID:33670194 |
Why this grade
Reasoning trace
The current record stores Grade B at moderate certainty and links 1 publishable source. A claim-specific domain-by-domain grading rationale is not available in this public record, so no reason for upgrading or downgrading is inferred here.
Audit and version
- Claim ID
- ec_pmid:33670194#1
- Claim version
- not reported
- Governance
- legacy, not verified
- Last evidence search
- not reported
- Last editorial review
- 2026-06-05T16:31:48.120Z
How it stacks up for energy / fatigue
- Ashwagandha vs Caffeine for energy / fatigue — Caffeine Grade B
- Ashwagandha vs Rhodiola for energy / fatigue — Rhodiola Grade C
- Ashwagandha vs CoQ10 for energy / fatigue — CoQ10 Grade C
- Ashwagandha vs Creatine for energy / fatigue — Creatine Grade C
- Ashwagandha vs Iron for energy / fatigue — Iron Grade A
- Ashwagandha vs Vitamin B12 for energy / fatigue — Vitamin B12 Grade C
- All interventions graded for energy / fatigue →
Grade history
No grade changes yet. Initial grade assigned; re-reviewed on every 12 months (Grade A/B) — next review by . Methodology v1.
Re-review cadence: every 12 months (Grade A/B) · next scheduled by · methodology v1.
Frequently asked
How long does Ashwagandha take to work for energy / fatigue?
Trials of Ashwagandha for energy / fatigue typically report effects within 2–4 weeks, though individual response varies. Studies rarely find benefit inside 1 week for chronic outcomes.
What dose was used in studies of Ashwagandha for energy / fatigue?
Studied doses for Ashwagandha in energy / fatigue trials cluster around a moderate daily dose. See the dose block for the specific range and how it varies by form.
Does Ashwagandha work for energy / fatigue if I'm not deficient?
The effect concentrates in healthy men and women. If your baseline is normal, expect a smaller effect than the trial averages.
Ashwagandha or the next-best alternative for energy / fatigue?
See the compare block above for the head-to-head with the most-cited alternative. Grade + certainty differences matter more than any single trial.
Related
- Ashwagandha for sleep — Grade C
- Ashwagandha for stress — Grade C
- Ashwagandha for strength — Grade B
- Ashwagandha for cognition — Grade C
- Ashwagandha for testosterone / hormone levels — Grade D
- Ashwagandha for strength — Grade C
- Full profile: Ashwagandha
- Is Ashwagandha hype?
- Everything graded for energy / fatigue
- Ashwagandha with SSRI
What this is — and is not
- Evidence description
- Ashwagandha supplementation was more efficacious than placebo for improving fatigue/recovery variables in healthy individuals.
- Substrate's interpretation
- The current reviewed record assigns Grade B at moderate certainty. A domain-by-domain rationale is shown only when recorded.
- Discuss with a clinician
- If you're on medication or have a condition that changes the calculus, bring the interaction & population blocks above to your pharmacist or prescriber before deciding.
- Individualized medical advice
- Not provided here or on any Substrate surface (API, agent tool, embed) — see YMYL policy.
Cite this page
Citation is encouraged. The proposed reuse license is CC-BY-4.0; status: pending-governance-ratification.
Plain-text citation
Substrate. Does Ashwagandha help energy / fatigue? (Grade B). https://evidencebased.info/interventions/ashwagandha/energy. Updated 2026-06-05.
BibTeX
@misc{substrate_onsashwagandhaenergy,
author = {Substrate editorial},
title = {Does Ashwagandha help energy / fatigue?},
year = {2026},
url = {https://evidencebased.info/interventions/ashwagandha/energy},
note = {Grade B, evidencebased.info}
}Found something wrong on this page? Report an error →