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Not medical advice. The Atlas is not a substitute for a clinician who can examine you.

Ashwagandha

The Ayurvedic Adaptogen Under the Microscope

Evidence grade 2 of 5, Thin. Read how the Atlas grades evidence.

Ashwagandha has better human evidence than many traditional herbs, though still limited. Multiple small-to-moderate randomized trials and reviews suggest it can modestly reduce stress and anxiety and lower cortisol, with some signals for improved sleep, and weaker evidence for athletic and other benefits. The trials are often small, short, industry-linked, and varied in formulation, so confidence is moderate, not high. The honest tier is "mixed/promising": a traditional herb with a plausibly real, modest anti-stress effect that is among the more studied botanicals, while still needing larger independent trials.

Reference only. Not medical advice.

What can go wrong

Ashwagandha appears generally well tolerated in short-term use (studies up to about 12 weeks), but several cautions are real and documented. The NIH LiverTox resource lists it as a likely cause of clinically apparent liver injury (likelihood score B), typically appearing within weeks to a few months of starting a product, presenting with jaundice and itching, and usually resolving after discontinuation, though rare severe cases have occurred. It can raise thyroid hormone levels and has been associated with a case of biochemical thyrotoxicosis, so it is a concern for anyone with thyroid disease or on thyroid medication. It is advised against in pregnancy and breastfeeding (traditionally regarded as an abortifacient risk and flagged in several regulatory reviews for possible reproductive effects) and may interact with sedatives, thyroid drugs, diabetes and blood-pressure medications, and immunosuppressants; caution is also advised with autoimmune conditions. As with any supplement, product content and purity are not guaranteed without third-party testing. Because pregnancy, thyroid disease, mental health, and medication interactions are involved, anyone considering ashwagandha, especially in these situations, should discuss it with a qualified healthcare provider before use.

Ashwagandha (Withania somnifera) is a root remedy prized in Ayurveda for more than two thousand years as a rasayana, a restorative meant to build strength and calm, and it is now among the best-selling stress supplements worldwide. For a botanical the modern evidence is relatively encouraging: several meta-analyses of randomized trials report modest reductions in perceived stress, anxiety, and serum cortisol, with a small signal for better sleep. The important qualifier is that these trials are mostly small, short, statistically noisy, and often funded by the makers of the specific extract being tested, so the certainty of the evidence has been rated low. Alongside the promise sits a documented safety concern that gets less airtime: since 2017 a growing set of case reports has tied ashwagandha to liver injury, and it has drawn caution or restriction from several national regulators. The considerations around pregnancy, thyroid disease, and interacting medications are best worked through with a qualified clinician.

A 2,000-year-old Ayurvedic "rejuvenative" now a best-selling stress supplement, with genuinely promising (if modest) anxiety evidence and a real, if uncommon, liver-injury signal.

How it is supposed to work

Proposed mechanisms include modulation of the stress response (lowering cortisol) and effects on GABA and serotonin signaling, consistent with calming and anti-anxiety effects. As with many botanicals, products vary widely in extract type and concentration, and the meaning/expectation response likely contributes.

What people get wrong

  • Often saidAshwagandha is a proven, risk-free cure for stress and anxiety.

    ActuallyRandomized trials and meta-analyses do show modest average reductions in stress, anxiety, and cortisol, but the trials are small, short, statistically noisy, and often funded by the extract makers, and one 2022 meta-analysis rated the certainty of that evidence as low. It is a studied option associated with modest benefit, not a guaranteed or risk-free one.

  • Often saidAs an ancient natural herb, ashwagandha has no safety concerns.

    ActuallyThe NIH LiverTox resource assigns ashwagandha a likelihood score of B as a likely cause of clinically apparent liver injury, with roughly 23 published cases by 2024. It can also raise thyroid hormone levels, is advised against in pregnancy, and may interact with sedatives, thyroid medication, and immunosuppressants. Long-standing and plant-derived does not mean free of risk.

  • Often saidAshwagandha only ever helps the thyroid.

    ActuallyIn small trials of people with subclinical hypothyroidism it raised T3 and T4 and lowered TSH, which some frame as a benefit, but that same stimulatory effect is a hazard for others: a case of biochemical thyrotoxicosis was reported in a patient with prior thyroiditis, and many trials exclude people with thyroid disease. Anyone with a thyroid condition or on thyroid medication should involve a clinician before using it.

  • Often saidAshwagandha liver injury means permanent, life-threatening damage.

    ActuallyIn the documented DILIN and Iceland case series the injury was typically cholestatic or mixed, with jaundice and itching, and it resolved after stopping the product, with liver tests normalizing within about one to five months and no deaths or transplants in that series. Rare fatal or transplant cases have been described, mostly in people with pre-existing liver disease, so the honest picture is uncommon, usually reversible, occasionally serious.

Who profits, and who pushes back

  • Anxiety/stress trialists

    endorsesRandomized-trial researchers

    Report modest reductions in perceived stress, anxiety, and cortisol with ashwagandha, while noting small samples, short durations, and frequent industry funding.

  • Ayurvedic tradition

    endorsesClassical rasayana use

    Values ashwagandha as a rejuvenative for vitality, resilience, and calm, used in formulated, individualized ways for over two thousand years.

  • Hepatology/regulatory bodies

    cautionsLiver-safety monitors

    Have flagged a growing number of ashwagandha-associated liver-injury cases, prompting safety advisories in several countries.

  • Supplement marketing

    Sells this. Has a commercial interest in a product sold as this compound, as of July 2026.

    championsAdaptogen brands

    Markets ashwagandha broadly for stress, sleep, energy, and performance, often overstating certainty and omitting liver and interaction cautions, with a commercial interest.

Where the research comes from

Most of the published research on this comes from one place. 100% of it is from Marketed worldwide as a stress/sleep supplement. Findings that no unrelated group has reproduced are weaker than the study count makes them look.

Share of published research by country of origin.
PlaceShare of published research
Marketed worldwide as a stress/sleep supplement100%

How we got here

Ashwagandha grows across India, the Middle East, and parts of Africa, and its documented use is Indian and ancient. The name is Sanskrit, usually read as 'smell of a horse,' pointing both to the root's odor and to the vigor it was meant to confer. It appears in the Ayurvedic classics, described in the Charaka Samhita and Sushruta Samhita (roughly the early centuries CE) as a rasayana and a balya, a strengthener, and prescribed for debility, wasting, and low vitality. Later compendia such as the Bhaishajya Ratnavali extended its use to complaints like chronic rheumatism and memory loss. For most of its history it was a household and physician's remedy within Ayurveda and allied South Asian traditions, prepared as a root powder often taken with milk or ghee. Only in the modern wellness era, as 'adaptogen' became a marketing category, did standardized extracts turn a regional tonic into a global supplement, which in turn drew both clinical trials and regulatory scrutiny.

  1. c. 1000 BCE-500 CEWithania somnifera named and used in the Ayurvedic tradition of the Indian subcontinent; classified as a rasayana and balya in texts attributed to Charaka and Sushruta
  2. Medieval periodLater Ayurvedic compendia such as the Bhaishajya Ratnavali record uses for debility, rheumatism, and memory complaints
  3. 2000s-2010sThe 'adaptogen' wellness trend and standardized root extracts turn ashwagandha into a global best-selling supplement
  4. 2017First published case reports link ashwagandha-containing products to acute liver injury
  5. 2021PLOS ONE meta-analysis (5 RCTs, 400 participants) reports a small but significant effect on sleep; Iceland/US DILIN case series documents 5 liver-injury cases
  6. 2023Denmark restricts ashwagandha in food supplements, citing a Danish Technical University risk assessment of possible thyroid, sex-hormone, and reproductive effects
  7. 2024France's ANSES issues a precautionary warning; LiverTox records roughly 23 published liver-injury cases and assigns a likelihood score of B
  8. 2025New systematic reviews (e.g. BJPsych Open, 15 RCTs) reaffirm modest stress, anxiety, and cortisol reductions while flagging low certainty

How it is understood

Ashwagandha (Withania somnifera) is one of Ayurveda's most prized herbs, a "rasayana" (rejuvenative) used for vitality, strength, and calm for over two thousand years. Its Sanskrit name evokes the strength of a horse, and it was traditionally taken to restore energy, resilience, and sleep. Today it is one of the best-selling herbal supplements in the world, marketed as an "adaptogen" for stress.

At a glance

Plant
Withania somnifera (ashwagandha)
Tradition
Ayurvedic rasayana (rejuvenative)
Best evidence
Modest stress/anxiety and cortisol reduction
Safety signals
Liver-injury reports; avoid in pregnancy

What this entry does not yet cover

What follows is unfinished work on our side, not a finding about Ashwagandha. A short entry is not a safe entry.

  • Cost and market. We have not documented what it sells for or who sells it.
  • Supply chain. We have not mapped where it is made.
  • Who uses it. We have not documented the user groups.
  • What could change. No forward-looking summary yet.
  • How it compares. We have not set it against the alternatives.
  • Children and teenagers. We have not checked what is known about younger people.
  • What people take it for. We have not catalogued the claims made for it.

Sources