THE RESEARCH LIBRARY
Ashwagandha: promising stress research, important cautions.
Updated 3 November 2026 · Root & Evidence editorial content · No independent clinical review claimed
On this page Jump to a section ↓
- Quick answer
- Evidence at a glance
- What is this supplement?
- Potential benefits
- What clinical trials found
- Side effects & interactions
- Dosage & forms
- Choosing a quality supplement
- Where to buy
- Frequently asked questions
- Bottom line
- References & related reading
Quick answer
Ashwagandha is an Ayurvedic botanical, usually sold as root or root-and-leaf extracts. Interest centers on stress and sleep, but preparations vary.
Some short studies suggest stress benefits. That is different from establishing treatment for an anxiety disorder or long-term safety.
Evidence at a glance
This guide discusses 1 selected publication. Counts refer only to the papers summarized here, not a complete count of all human research. A meta-analysis and its included trials must not be counted as independent evidence.
Read our five-label rating framework ↗ · “Not yet rated” is a review status, not a sixth rating. These are selected evidence summaries, not completed systematic reviews.
What is this supplement?
Withania somnifera is a botanical associated with Ayurveda. Root-only and root-and-leaf extracts can differ in composition; a percentage of withanolides does not establish clinical equivalence.
Potential benefits
Stress
The selected trial reported improvement, with limited duration and a small sample.
Sleep
Not assessed by the selected stress trial; sleep and stress are separate outcomes.
See the study results below before applying a claim to a different person, product, or outcome.
What clinical trials actually found
On a small screen, swipe the comparison table horizontally. Individual study snapshots below provide the same findings in a narrower layout.
RESEARCH SNAPSHOT
Chandrasekhar et al. · 2012
Single-center double-blind randomized placebo-controlled trial · 64 adults with chronic stress · 60 days · Studied preparation: 300 mg root extract twice daily
Read the original publication on PubMed ↗
Evidence certainty: Not assigned in this selected-study summary
Limitations: Small, short study of a specific extract; cannot establish long-term safety or treat all anxiety disorders.
Side effects & interactions
Avoid during pregnancy and breastfeeding. Liver injury has been reported. Thyroid or autoimmune disorders, surgery, sedatives, thyroid drugs, immunosuppressants, and blood-sugar or blood-pressure medicines warrant particular caution and professional advice.
This is not a complete interaction list. Bring all medicines and supplements, including amounts, to a pharmacist or clinician. Do not stop prescribed care.
Read the interaction guide ↗
Practical dosage & forms
The selected trial used a specific 300 mg root extract twice daily for 60 days. This does not establish a universal stress or sleep dose, and cannot be converted directly to raw herb or another extract.
Studied dose ≠ established recommendation. A protocol describes what researchers tested; it does not establish the right dose for you. Formulation, population, duration, and monitoring all matter.
Official background and safety source ↗
How to choose a quality supplement
Check Withania somnifera, plant part, extract amount, and any stated standardization. Avoid assuming that two extracts with the same milligram amount match the trial.
- Check the full serving size, active ingredient amount, and added ingredients.
- Look for a verifiable independent testing listing or batch-specific certificate; check what was actually tested.
- Prefer a manufacturer that identifies itself, provides lot and expiry details, and answers questions about testing methods.
- Testing for identity or contaminants does not prove that a supplement works.
Read Supplement Facts labels ↗ · Understand testing claims ↗
Frequently asked questions
Does a positive study mean ashwagandha will help me?
No. Average trial results depend on the people, outcome, formulation, and duration studied. Your circumstances can differ.
Should I copy the dose in the study?
No. Use the dosage section to understand the research and prepare questions for your clinician; it is not a personal prescription.
Does third-party testing prove effectiveness?
No. It can support specific quality claims within the scope of testing. Clinical benefit requires separate human evidence.
Bottom line
Match any question about benefit to the actual extract studied. A short-term signal does not cancel the liver, thyroid, or medication cautions.
A THOUGHTFUL DOSE OF PERSPECTIVE
Keep your curiosity going.
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