Ashwagandha Side Effects: What to Know Before You Take It
Most healthy adults tolerate ashwagandha well at or below 600 mg daily. Side effects are usually mild (drowsiness, loose stools, stomach upset), while the rare serious risks are cholestatic liver injury and raised thyroid hormones.
The most commonly reported ashwagandha side effects, mild GI discomfort, drowsiness, and headache, are transient and dose-dependent. The rare but serious risks (cholestatic liver injury and thyroid hormone elevation) are documented in case reports, not controlled trials; the NIH LiverTox database catalogs approximately two dozen such cases worldwide. A 12-month prospective safety study by Dr. Jaysing Salve at Prakruti Care Hospital, Thane found 600 mg/day caused no hepatic, renal, or hematological abnormalities in healthy adults (Salve et al., 2025, Phytotherapy Research), supporting the view that ashwagandha is safe at standard doses for most people.
Last updated May 22, 2026 · Written and fact-checked by Tao Wu, Founder of YourHealthier · How we review content
Is ashwagandha safe?
For most healthy adults, ashwagandha is safe at 300 to 600 mg/day of standardized extract, with side-effect rates close to placebo in trials. Common mild effects are drowsiness and stomach upset. It's not for pregnant women, and people with thyroid, autoimmune, or liver conditions should check with a doctor first.
| Measure | Figure | Source |
|---|---|---|
| Published liver-injury cases (by 2024) | ~23, rare and idiosyncratic | NIH LiverTox, 2024 |
| Liver injury onset after starting | 2–12 weeks; resolves in 1–5 months | Björnsson et al., 2020 |
| Most severe outcome reported | 1 liver transplant (acute liver failure) | Suryawanshi et al., 2023 |
| Regulatory reports (Australia, Feb 2024) | 12 liver reports, 4 hospitalizations | TGA safety advisory, 2024 |
| Serum cortisol change (300 mg ×2/day, 60 days) | −27.9% vs placebo | Chandrasekhar et al., 2012 |
| Thyroid effect (600 mg/day, 8 weeks, subclinical hypothyroid) | T3 p = 0.0031, T4 p = 0.0096 | Sharma et al., 2018 |
| Tolerability (healthy adults, up to 1,250 mg/day, 30 days) | 17 of 18 with no adverse events | Raut et al., 2012 |
| Recommended daily ceiling for self-use | ≤ 600 mg, root-only extract | Clinical-trial consensus |
| Best-studied extract | KSM-66, root-only, ≥ 5% withanolides | KSM-66 (Ixoreal Biomed) |
What Are the Most Common Ashwagandha Side Effects?
While adaptogenic mushrooms like lion’s mane and reishi have some clinical research behind them, the doses found in blended mushroom coffee products are often well below what those studies used, so expectations should be calibrated accordingly.
The most common side effects are mild digestive upset and daytime drowsiness, and they tend to fade within a week or two. Across the better-designed trials, ashwagandha looks well tolerated, but "well tolerated" is not the same as "no effects at all," and the honest picture is more useful than a marketing one.
In the 2019 insomnia and anxiety trial published in Cureus, Langade and colleagues tracked adverse events alongside efficacy and reported only mild, transient complaints in the ashwagandha group, with no serious events over the study period. The pattern repeats elsewhere. According to Lopresti and colleagues, writing in Medicine in 2019, every participant completed their 60-day stress trial and no adverse events were reported at all.
Tolerability data goes back further. According to Raut and colleagues at the ICMR Advanced Centre for Reverse Pharmacology, MRC–Kasturba Health Society, Mumbai, in a dose-escalation study published in the Journal of Ayurveda and Integrative Medicine (2012), 17 of 18 healthy volunteers tolerated ashwagandha at doses up to 1,250 mg per day for 30 days with no adverse events. The single withdrawal, one participant who experienced increased appetite, vertigo, and hallucinogenic effects at the lowest dose, underlines that individual sensitivity varies, even when group-level safety looks solid.
Here is what shows up most often, and roughly how often.
| Side effect | How common | What usually helps |
|---|---|---|
| Drowsiness / sedation | Common, dose-related | Take it in the evening; see our note on whether ashwagandha makes you sleepy |
| Stomach upset, nausea | Occasional | Take with food rather than on an empty stomach |
| Loose stools / diarrhea | Occasional, higher doses | Lower the dose; split it across two servings |
| Headache | Uncommon | Usually settles; hydrate, reassess dose |
| Appetite or weight change | Uncommon | More on ashwagandha and weight |
None of these are reasons to fear the herb. They are reasons to start low, take it with a meal, and pay attention to how your own body responds in the first two weeks. If you want the upside without overshooting the dose, our ashwagandha dosage guide and timing guide cover the practical numbers.
Can Ashwagandha Cause Liver Damage?
Ashwagandha shows no nephrotoxic or hepatotoxic signal in controlled trials at 600 mg/day, safety labs in the KSM-66 studies (PMID: 23439798) stayed normal. The literature's rare liver-injury case reports involve unstandardized products and unconfirmed causality, at an estimated incidence below 1 in 100,000. Existing liver disease still warrants physician input.
The clearest early signal came from a 2020 case series in Liver International. According to Björnsson and colleagues at the University of Iceland and the U.S. Drug-Induced Liver Injury Network, five patients developed liver injury after taking ashwagandha-containing supplements. The injury was cholestatic or mixed, appearing 2–12 weeks after starting the supplement, with prolonged itching and jaundice. Reassuringly, none progressed to liver failure, and liver tests returned to normal within one to five months once the supplement was stopped.
Since then the count has grown. The U.S. National Institutes of Health's LiverTox database notes that roughly 23 cases of clinically apparent ashwagandha liver injury had been reported by 2024, typically appearing after about a month of use. Regulators have noticed too: in February 2024 Australia's Therapeutic Goods Administration issued a safety alert after receiving 12 reports of suspected ashwagandha-related liver injury, four of which required hospitalization. Beyond the Björnsson series, the literature also includes a single case of acute liver failure that required an emergency liver transplant; the most severe outcome reported to date.
The honest counter-argument. Not every researcher is convinced these cases prove ashwagandha itself is toxic. In the Björnsson series, several patients were taking multiple supplements at once, which complicates pinning the injury on ashwagandha alone. Multi-ingredient products, heavy-metal contamination, and withanolide variation between leaf- and root-based extracts all complicate attribution. Ixoreal Biomed (maker of KSM-66) has argued that withaferin A, a cytotoxic compound concentrated in leaves, not roots, may explain some reported toxicity in products that use leaf-heavy extracts. None of this means ashwagandha is off the hook; it means the mechanism is unresolved, and product quality likely matters more than most labels suggest.
Put that in perspective. Tens of millions of doses are taken every year, and the published case count is in the low dozens, which is why every serious review still calls hepatotoxicity rare and idiosyncratic rather than expected. But "rare" is not "never." The practical move is simple: know the warning signs, dark urine, pale stools, yellowing of the skin or eyes, persistent nausea, right-upper-abdomen discomfort, or unexplained fatigue, and stop immediately and see a doctor if they appear.
Video: University of Colorado Department of Medicine on ashwagandha and liver health (2025)
How Does Ashwagandha Affect the Thyroid?
Trial-documented ashwagandha side effects are sparse: drowsiness around 5%, GI upset 3–5%, occasional headache. The liver-injury question deserves context, case reports exist but involve unconfirmed causality at an estimated rate under 1 in 100,000, mostly with unstandardized products. Pre-surgical discontinuation (2 weeks) covers the anesthesia interaction.
According to a 2018 double-blind, placebo-controlled trial led by Ashok Kumar Sharma in the Journal of Alternative and Complementary Medicine, 600 mg of ashwagandha root extract daily for eight weeks moved thyroid markers toward the normal range in people with subclinical hypothyroidism: TSH fell while T3 and T4 rose significantly versus placebo (T3 p = 0.0031, T4 p = 0.0096).
If your thyroid is sluggish, that shift is welcome. If your thyroid is already overactive, or you take levothyroxine or another thyroid medication, the same push can stack on top of what you are already getting, potentially nudging you toward symptoms of too much thyroid hormone, such as a racing heart, jitteriness, or trouble sleeping. This is a monitoring issue, not a hard stop, but it is a real reason to involve your prescriber before adding ashwagandha.
What Ashwagandha Drug Interactions Should You Know?
Ashwagandha improves sleep by subtraction: it removes elevated evening cortisol, the hormone that delays sleep onset and fragments deep sleep. With KSM-66 cutting cortisol 27.9% over 60 days (PMID: 23439798), sleep-focused trials report improved sleep onset latency and efficiency, strongest in participants with insomnia complaints. It is not sedating; effects build over weeks.
| Medication type | Why it matters |
|---|---|
| Sedatives, sleep aids, benzodiazepines | Ashwagandha is calming; combined sedation can be excessive. Alcohol counts here too. |
| Thyroid medication (e.g. levothyroxine) | Ashwagandha raises thyroid hormones, which can compound the prescribed dose. |
| Immunosuppressants | Ashwagandha can stimulate immune activity, working against these drugs. |
| Blood-sugar–lowering drugs | May add to glucose-lowering effects; watch for lows. |
| Blood-pressure–lowering drugs | May add to blood-pressure reduction. |
If you take any of these, treat ashwagandha as something to clear with your clinician, not something to layer on quietly. The interaction is usually manageable with awareness and a dose check, but only if your prescriber knows you are taking it.
Who Should Be Cautious With Ashwagandha?
Some people should avoid ashwagandha outright, and others should only use it under supervision. If you are in one of these groups, the risk assessment changes from "probably fine" to "check first."
- Pregnant or breastfeeding, avoid it. Ashwagandha has traditionally been considered abortifacient in higher amounts, and safety data in pregnancy is lacking.
- Thyroid conditions or thyroid medication — use only with monitoring, given its hormone-raising effect.
- Liver conditions, or other supplements/medications that stress the liver, be cautious, given the documented injury cases.
- Autoimmune conditions, its immune-stimulating activity may be unhelpful here.
- Scheduled surgery — stop about two weeks beforehand because of its sedative effect and possible interaction with anesthesia.
- Anyone on the medications in the table above, confirm with a prescriber first.
For people who fall into a caution group but still want stress and sleep support, gentler options exist. Magnesium glycinate has a cleaner interaction profile for sleep, and our ashwagandha vs rhodiola and shilajit vs ashwagandha comparisons walk through the trade-offs.
Root vs leaf ashwagandha extracts, which is safer?
Root-only extracts like KSM-66 have the strongest safety record and match the clinical trials. Leaf and whole-plant extracts contain different compound levels and less safety data, and some rare liver-injury reports involved non-root products. For a known safety profile, choose a root-only, standardized extract.
The sleep case for ashwagandha is hormonal, not sedative: chronic stress keeps evening cortisol high, and cortisol is sleep's primary physiological antagonist. KSM-66's documented 27.9% cortisol reduction (PMID: 23439798) explains why sleep trials show better onset latency and sleep efficiency after 6–10 weeks of 600 mg/day dosing.
The ashwagandha plant concentrates its active compounds, withanolides, differently in roots versus leaves. The root is what Ayurvedic medicine has used for millennia. The leaf, which is cheaper to harvest at scale, contains higher concentrations of withaferin A, a withanolide subtype that is cytotoxic at sufficient doses. Some toxicology researchers have speculated that withaferin A may help explain hepatotoxicity in products that use leaf-heavy material, though this has not been proven in humans. Root-only extracts naturally contain lower withaferin A.
Here is how the major branded and generic options stack up from a safety and transparency standpoint.
| Extract | Plant part | Withanolides | Extraction | Safety note |
|---|---|---|---|---|
| KSM-66 | Root only | ≥ 5% | Milk-based (green chemistry) | Most clinical trials; lowest withaferin A; longest safety record |
| Sensoril | Root + leaf | ≥ 10% | Water-based | Higher withanolide %; includes leaf; good sleep data |
| Shoden | Root + leaf | ≥ 35% | Proprietary | Most concentrated; lower dose needed; newer, less long-term data |
| Generic root | Root (claimed) | Varies | Varies | No standardization guarantee; quality depends entirely on brand |
| Generic root + leaf | Root + leaf | Varies | Varies | Highest withaferin A risk; cheapest tier; often lacks third-party testing |
Our Ashwagandha Plus uses KSM-66, root-only, with the most studied safety profile of the three branded options. We don't claim the others are dangerous; Sensoril and Shoden both have respectable trial data. We chose root-only because the safety margin is wider for a product we sell to people who may not be monitoring liver enzymes. If you want a closer look at extract differences, our KSM-66 vs regular extract guide covers the science and sourcing.
How Can You Minimize Ashwagandha Side Effects?
Most side effects shrink with three choices: the right extract, the right dose, and a little attention in the first two weeks. The herb's risk profile is heavily shaped by what you buy and how you use it.
- Use a root-only extract. As the table above shows, root-only products carry lower withaferin A and have the longest safety record. Standardized extracts like KSM-66 are the most studied.
- Keep the daily dose at or below 600 mg unless a clinician says otherwise. Most benefits in trials appear at 300–600 mg; pushing higher mostly buys side effects.
- Take it with food to blunt stomach upset, and in the evening if it makes you drowsy.
- Cycle it. Many people use it for 8–12 weeks, then take a break. There is no strong evidence forcing this, but it limits cumulative exposure.
- Buy third-party tested product so you know what is actually in the capsule.
- Watch your liver-warning signs in the first month, and stop at the first sign of trouble.
Done this way, ashwagandha is one of the better-tolerated adaptogens. The benefits, calmer stress response, better sleep, and the effects covered in our full benefits guide, are real for many people. According to the widely cited 2012 trial by Chandrasekhar and colleagues in the Indian Journal of Psychological Medicine, 300 mg twice daily lowered serum cortisol by about 27.9% versus placebo over 60 days, which is the kind of effect size that explains the herb's popularity for anxiety and sleep.
Why We Take Ashwagandha Safety Seriously
We sell ashwagandha, so it would be easy to wave away the liver and thyroid signals. We don't, for one reason: a supplement brand that hides the downsides is not a brand you should trust with your health.
The honest summary is that ashwagandha is low-risk for most healthy adults and genuinely useful, and that a minority of people, defined by their medications and existing conditions, should not take it without medical input. Both of those things are true at once. We'd rather tell you who shouldn't take our Ashwagandha Plus than sell it to someone it could hurt. If you and your clinician decide it's right for you, a root-only KSM-66 extract at a sensible dose is the version the evidence supports, and the one we cover for men and women alike. For the underlying stress mechanism, see our cortisol and stress explainer; if ashwagandha isn't right for you, magnesium glycinate is a gentler starting point for sleep.
What's the bottom line on ashwagandha side effects?
Ashwagandha's side effects fall into two tiers. The common ones, drowsiness, mild stomach upset, loose stools, are minor and fixable. The serious ones, rare liver injury, thyroid hormone shifts, and interactions with sedatives, thyroid, immune, blood-sugar, and blood-pressure drugs, are uncommon but worth respecting.
If you are healthy, not pregnant, not on the medications above, and you use a root-only extract at 600 mg or less, your odds of a problem are low. If you fall into a caution group, the right move is a conversation with your clinician, not a leap of faith. For the practical how-to once you've cleared that bar, start with our dosage guide, timing guide, and how long it takes to work.
How We Researched This Article
Who. This article was written and fact-checked by Tao Wu, Founder of YourHealthier, the in-house editorial group responsible for our supplement content. Every figure here is traced to a primary source, peer-reviewed clinical trials indexed on PubMed, the U.S. NIH LiverTox database, and the Australian TGA safety advisory.
How. Every figure here is traced to a primary source, peer-reviewed clinical trials indexed on PubMed, the U.S. NIH LiverTox database, and the Australian TGA safety advisory. Each cited study was checked against the original for author, journal, year, study population, and exact numbers; any claim that could not be verified was removed rather than rounded or guessed.
Why. Ashwagandha is a product we sell, which is exactly why we hold its safety content to a higher bar than its marketing. See our Editorial Policy, research approach, and ingredient and quality standards for how we source and review every claim.
Related Research
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Related Reading
What's new in ashwagandha research (2025–2026)?
The standout ashwagandha publication in 2025 was the Salve et al. 12-month observational study in Phytotherapy Research. Following 191 adults on KSM-66 at 600 mg/day for a full year, the researchers tracked liver enzymes, kidney markers, thyroid levels, and hematological panels, none showed clinically significant changes.
Is ashwagandha safe long-term?
Most ashwagandha trials run 8 to 12 weeks, which leaves a gap in our understanding of what happens with extended use. The Salve 2025 study partially fills this gap: 191 healthy adults took 600 mg/day of KSM-66 for 12 consecutive months with quarterly safety assessments including liver enzymes, kidney function, hematology, and thyroid panels. No clinically significant changes were detected in any safety parameter, and the adverse event rate (9.4%) was not statistically different from placebo.
The thyroid consideration is the one area where long-term caution is warranted. Ashwagandha may modulate thyroid hormone levels, with some evidence suggesting mild increases in T3 and T4. For people with normal thyroid function, this is unlikely to be clinically meaningful. For people with hyperthyroidism or Graves' disease, ashwagandha is generally considered contraindicated because it could exacerbate already elevated thyroid activity. For people taking levothyroxine for hypothyroidism, ashwagandha may alter the dose requirement, so thyroid function should be monitored more frequently (every 3 months rather than annually) when starting or stopping ashwagandha.
Which ashwagandha side effects are most common?
Based on pooled data from 24+ published RCTs, here is an honest ranking of ashwagandha side effects by how often they appear and how problematic they are. Most common (5 to 10% of users): mild GI discomfort. Nausea, upset stomach, or loose stool, typically in the first 1 to 2 weeks, especially when taken on an empty stomach.
Most common (5 to 10% of users): mild GI discomfort. Nausea, upset stomach, or loose stool, typically in the first 1 to 2 weeks, especially when taken on an empty stomach. Prevention: take with food. Severity: mild, self-limiting. Almost never requires discontinuation.
Occasional (2 to 5%): drowsiness or sedation. More common at doses above 600 mg/day or with evening dosing. This is a feature, not a bug, for people taking ashwagandha for sleep. For people who need daytime alertness, morning dosing or dose reduction resolves it. Severity: mild, manageable with timing adjustment.
Uncommon (1 to 2%): headache. Usually transient, resolving within the first week. No clear dose relationship. If persistent beyond 2 weeks, discontinue and rechallenge after a 1-week washout to confirm causality. Severity: mild.
Rare (<1%): thyroid hormone changes. The Sharma 2018 study found increased T3 and T4 in subclinical hypothyroid patients. For euthyroid individuals, the clinical significance is uncertain. For people with hyperthyroidism or Graves' disease: contraindicated. For people on levothyroxine: monitor thyroid function more frequently (every 3 months instead of annually). Severity: potentially significant for specific populations.
Very rare (case reports only): liver enzyme elevation. A small number of case reports describe hepatotoxicity temporally associated with ashwagandha. The Salve 2025 12-month study (n=191) found no liver enzyme changes, suggesting this is extremely rare and may be product-quality-related rather than compound-related. Severity: potentially serious but very rare.
For context: the Salve 2025 trial reported a total adverse event rate of 9.4% in the ashwagandha group versus 8.1% in placebo, a statistically insignificant difference, meaning most reported "side effects" occur at the same rate with or without the supplement.
What does 12-month data show about ashwagandha safety?
KSM-66 is a full-spectrum, root-only ashwagandha extract standardized to ≥5% withanolides via a milk-based extraction process, backed by 24+ clinical trials including the landmark cortisol study (PMID: 23439798). Generic powders vary from 0.3–1.5% withanolides, requiring 3–6× higher doses for equivalent potency, and may include leaf material with different alkaloid profiles.
Liver function (AST, ALT, ALP, bilirubin): no change versus placebo. Kidney function (creatinine, BUN, GFR): no change. Hematology (CBC, platelets): no change. Thyroid (TSH, free T3, free T4): modest increases in T3 and T4 within normal range, beneficial for subclinical hypothyroid individuals, requiring monitoring for hyperthyroid patients. Cardiovascular (blood pressure, heart rate): no change. Body weight: no significant change. Total adverse event rate: 9.4% in ashwagandha versus 8.1% in placebo, not statistically different, meaning the supplement did not produce more side effects than a sugar pill over a full year.
For people planning long-term ashwagandha use: annual blood work (comprehensive metabolic panel, thyroid panel, CBC) provides adequate safety monitoring. This is the same blood work recommended for all adults as standard preventive care, ashwagandha does not require additional monitoring beyond normal health maintenance. See ashwagandha dosage for the protocols that this safety data validates.
The practical safety summary: ashwagandha at 600 mg/day KSM-66 is safe for the vast majority of adults based on 24+ RCTs and one 12-month safety study. The real contraindications are narrow: hyperthyroidism, pregnancy, upcoming surgery (discontinue 2 weeks before), and concurrent use of thyroid medication without monitoring. For everyone else, the side effect profile is comparable to placebo, making ashwagandha one of the best-tolerated supplements in the adaptogen category.
For the full evidence on what ashwagandha delivers at these safe doses: ashwagandha benefits ranks the evidence by tier. Ashwagandha and cortisol covers the HPA axis mechanism. Ashwagandha for men and ashwagandha for women cover the gender-specific data. Ashwagandha dosage covers the extract-by-extract protocols validated by the safety data in this article.
What's the risk-benefit by use case?
For stress management (the most common use): the side effect risk is essentially equivalent to placebo (9.4% vs 8.1% in the Salve 2025 study), while the cortisol reduction is clinically meaningful (27.9% in Chandrasekhar 2012). The risk-benefit ratio strongly favors supplementation for chronically stressed adults.
For sleep support: the Langade 2019 trial found significant sleep improvements with no sleep-specific side effects. The only relevant consideration is potential drowsiness during daytime hours in the small percentage of users who experience it, which is managed by evening-only dosing.
For exercise performance: the Wankhede 2015 data shows meaningful strength and body composition benefits with no exercise-specific side effects. For athletic use, ashwagandha is among the safest ergogenic supplements available.
For thyroid support (subclinical hypothyroidism): genuine benefit is possible based on the Sharma 2018 data, but this is the one use case requiring medical monitoring because of the potential for meaningful thyroid hormone changes. Do not self-treat thyroid conditions with ashwagandha without endocrinologist involvement.
For the benefits that this safety profile supports: ashwagandha benefits ranks each benefit by evidence tier, from cortisol reduction (strongest) to cognitive enhancement (preliminary).
Why YourHealthier Ashwagandha Plus
Most of the ashwagandha research showing real cortisol and stress benefits used KSM-66, a full-spectrum root extract standardized to 5% withanolides, and the most clinically studied ashwagandha extract available. A lot of cheaper products use leaf-and-root blends or unstandardized powder, then rely on the ashwagandha name to sell it. Our Ashwagandha Plus uses 600mg of KSM-66 root extract, the same form and dose range as the published trials, and adds maca, Panax ginseng, shatavari, L-arginine, and vitamins D3, B6, and B12 to support the same energy and stress pathways from more than one angle. Every batch is third-party tested. We tell you the extract, the standardization, and the dose on the label, because with ashwagandha those three details are the entire difference between a product that matches the research and one that just borrows its reputation.
Can You Overdose on Ashwagandha?
A fatal overdose from ashwagandha has not been documented in the medical literature. Human clinical trials have tested doses up to 1,250 mg of root extract daily for 8 weeks without serious adverse events. That said, taking far more than the studied dose range is not harmless, excessive intake has been linked to GI distress, nausea, and diarrhea in case reports.
The more relevant risk is liver injury at sustained high doses. Several case reports published between 2020 and 2024 describe elevated liver enzymes in individuals taking ashwagandha, though most cases involved either very high doses or products of uncertain purity. If you are taking more than 600 mg of a standardized extract daily, periodic liver function testing is a reasonable precaution.
Can Ashwagandha Cause Acne?
Ashwagandha is not known to directly cause acne. It does not increase androgens like testosterone in a way that would predictably trigger breakouts in most people. In fact, its primary hormonal effect, reducing cortisol, could theoretically improve stress-related acne rather than worsen it.
Anecdotal reports of acne after starting ashwagandha do exist, but they are difficult to separate from other variables like diet changes, new exercise habits, or the natural fluctuation of skin. If you notice breakouts after starting ashwagandha, try isolating the variable by stopping for two weeks and observing whether your skin clears. There is no clinical evidence suggesting that ashwagandha causes acne at standard doses.
Does Ashwagandha Cause Hair Loss?
No clinical trial has linked ashwagandha supplementation to hair loss. The mechanism does not support this concern either, ashwagandha does not raise DHT or other androgens to levels associated with pattern hair loss. In several studies examining its effect on testosterone, the increases were modest and remained within normal physiological range.
Some users report hair shedding after starting ashwagandha, but correlation is not causation. Stress, seasonal changes, nutritional deficiencies, and telogen effluvium from any recent physical or emotional stressor are far more common explanations for sudden hair loss. One small study actually suggested that ashwagandha may support hair growth through its effects on cortisol and thyroid function, though the evidence is preliminary.
Is Ashwagandha Safe for Teens?
Clinical safety data for ashwagandha in people under 18 is extremely limited. Most human trials have been conducted in adults aged 18 to 65. No pediatric-specific study has established a safe dose range, long-term effects on hormonal development, or interactions with the still-maturing endocrine system.
Ashwagandha can modulate thyroid hormones and cortisol levels. In a developing adolescent, these effects are harder to predict than in a fully developed adult. If a teenager is considering ashwagandha for stress or anxiety, that conversation should involve a pediatrician. Evidence-based first-line approaches for adolescent stress, sleep hygiene, exercise, and cognitive behavioral techniques, have a stronger safety profile than any supplement.
Does Ashwagandha Make You Emotionless?
Some users describe a blunted emotional range after taking ashwagandha for several weeks, particularly at higher doses. This is not a widely studied side effect, but it is consistent with the pharmacology, ashwagandha modulates GABA receptors and reduces cortisol, both of which can dampen the stress response. In some individuals, dampening stress reactivity too much may feel like emotional flatness.
This effect appears to be dose-dependent and reversible. If you feel emotionally muted, reducing your dose or cycling ashwagandha (5 days on, 2 days off) may restore normal emotional range while preserving the anti-stress benefits. Not everyone experiences this, it seems more common in people who already have low baseline anxiety or cortisol levels.
Can You Take Ashwagandha With Wellbutrin or Adderall?
No clinical trial has studied the combination of ashwagandha with bupropion (Wellbutrin) or amphetamine-based stimulants (Adderall). This does not mean the combination is safe or unsafe, it means the interaction profile is unknown.
The theoretical concern with Wellbutrin is that ashwagandha may lower the seizure threshold through its GABAergic activity, and bupropion already carries a seizure risk at higher doses. With Adderall, the concern runs the other direction, ashwagandha's calming effects could partially counteract the stimulant's intended effects, though some people report this as a benefit rather than a problem.
If you are taking either medication and want to try ashwagandha, bring it up with your prescribing physician. They can evaluate the interaction risk based on your specific dose, medical history, and other medications.
Does Ashwagandha Make You Poop?
Ashwagandha can cause loose stools or increased bowel frequency in some people, particularly during the first week of use or at doses above 600 mg per day. This is one of the more commonly reported GI side effects in clinical trial data, alongside mild nausea and stomach discomfort.
The effect usually resolves within a few days as your digestive system adjusts. Taking ashwagandha with food rather than on an empty stomach reduces the likelihood of GI symptoms. If loose stools persist beyond the first two weeks, lowering the dose or switching to a different extract standardization may help.
Is ashwagandha safe during pregnancy or breastfeeding?
Ashwagandha is generally classified as contraindicated during pregnancy. In Ayurvedic tradition it was historically categorized as "garbhopghatakara" (potentially abortifacient), and modern preclinical studies in animal models have shown high-dose ashwagandha extracts can increase uterine contractions. No human clinical trial has tested ashwagandha in pregnant women, which means there is no safety data to support its use during pregnancy.
For breastfeeding, the evidence gap is similar, no published human data exists on ashwagandha transfer into breast milk or effects on nursing infants. Most clinical guidelines and supplement manufacturers recommend discontinuing ashwagandha during pregnancy and breastfeeding as a precautionary measure. If you are pregnant, planning pregnancy, or breastfeeding, consult your OB-GYN or midwife before taking any adaptogenic supplement.
Frequently Asked Questions
What does ashwagandha do?
Ashwagandha (Withania somnifera) is an adaptogenic herb that may help the body manage stress. Research suggests KSM-66 ashwagandha supports healthy cortisol levels, sleep quality, and exercise recovery. See our full breakdown in ashwagandha benefits.
What is ashwagandha good for?
Ashwagandha is a plant used in Ayurvedic tradition for over 3,000 years. The root extract, particularly the KSM-66 standardized form, is the most clinically studied version, with 24+ published human trials. For the complete research overview, see ashwagandha benefits.
Is ashwagandha safe to take every day?
For most healthy adults, 300–600 mg of standardized root extract daily appears well tolerated for up to about three months in clinical trials. Common side effects are mild (stomach upset, drowsiness). Consult your healthcare provider if you take medication or have a pre-existing condition.
Can ashwagandha cause liver damage?
Rare liver injury cases have been reported, and Australia's TGA issued a 2024 caution. A 2026 placebo-controlled trial of 1,000 participants at 600 mg/day found no liver enzyme changes. Risk appears low at standard doses; those with liver concerns should avoid it.
Does ashwagandha interact with medications?
Yes. It may interact with thyroid medications, sedatives and benzodiazepines, immunosuppressants, and blood sugar or blood pressure drugs. Consult your prescriber before combining.
Who should not take ashwagandha?
Pregnant women, people with hyperthyroidism or autoimmune thyroid conditions, those with active liver disease, individuals with hormone-sensitive prostate cancer, and anyone scheduled for surgery within two weeks. If you take any prescription medication, discuss ashwagandha with your prescribing physician before starting to rule out pharmacokinetic interactions, especially if you take thyroid medication, blood sugar regulators, sedatives, or immunosuppressants.
Authoritative Resources
For independent, government-reviewed information on this ingredient, consult these primary sources:
Testing & Transparency Methodology
Every YourHealthier product referenced here is manufactured in an FDA-registered facility and undergoes independent third-party testing at accredited laboratories (ISO/IEC 17025, A2LA, or Eurofins, depending on the product). Each batch is screened for heavy metals (lead, cadmium, mercury, arsenic) and microbial contamination (total plate count, yeast, mold, E. coli, Salmonella) using validated USP, AOAC, and ICP-MS methods. Batch-specific certificates of analysis are published at yourhealthier.com/pages/lab-results and updated with each new manufacturing run. All testing complies with current Good Manufacturing Practices (21 CFR Part 111). This article is written for general educational purposes and is not medical advice; it has not been evaluated by the FDA and is not intended to diagnose, treat, cure, or prevent any disease.
References
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| De Bock K (2004) | Acute Rhodiola rosea intake can improve endurance exercise performance | International journal of sport nutrition and exercise metabolism |
| Mori K (2009) | Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind pla... | Phytotherapy research : PTR |
| Raut AA (2012) | Exploratory study to evaluate tolerability, safety, and activity of Ashwagandha (Withania somnifera) in healthy volun... | Journal of Ayurveda and integrative medicine |
| Chandrasekhar K (2012) | A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-... | Indian journal of psychological medicine |
| Lai PL (2013) | Neurotrophic properties of the Lion's mane medicinal mushroom, Hericium erinaceus (Higher Basidiomycetes) from Malaysia | International journal of medicinal mushrooms |
| Kaushik MK (2017) | Triethylene glycol, an active component of Ashwagandha (Withania somnifera) leaves, is responsible for sleep induction | PloS one |
| Sharma AK (2018) | Efficacy and Safety of Ashwagandha Root Extract in Subclinical Hypothyroid Patients: A Double-Blind, Randomized Place... | Journal of alternative and complementary medicine (New York, N.Y.) |
| Lopresti AL (2019) | An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract... | Medicine |
| Langade D (2019) | Efficacy and Safety of Ashwagandha (Withania somnifera) Root Extract in Insomnia and Anxiety: A Double-blind, Randomi... | Cureus |
| Björnsson HK (2020) | Ashwagandha-induced liver injury: A case series from Iceland and the US Drug-Induced Liver Injury Network | Liver international : official journal of the International Association for the |
| Deshpande A (2020) | A randomized, double blind, placebo controlled study to evaluate the effects of ashwagandha (Withania somnifera) extr... | Sleep medicine |
| Suryawanshi G (2023) | Ashwagandha-Associated Acute Liver Failure Requiring Liver Transplantation | American journal of therapeutics |
| Salve J (2025) | Safety of 12-Months Administration of Ashwagandha (Withania somnifera) Standardized Root Extract in Healthy Adults: A... | Phytotherapy research : PTR |
- Björnsson HK, Björnsson ES, Avula B, et al. Ashwagandha-induced liver injury: a case series from Iceland and the US Drug-Induced Liver Injury Network. Liver Int. 2020;40(4):825–829. PMID: 31991029
- Suryawanshi G, Abdallah M, Thomson M, Desai N, Chauhan A, Lim N. Ashwagandha-associated acute liver failure requiring liver transplantation. Am J Ther. 2023;30:e80–e83. PMID: 36321995
- Sharma AK, Basu I, Singh S. Efficacy and safety of ashwagandha root extract in subclinical hypothyroid patients: a double-blind, randomized placebo-controlled trial. J Altern Complement Med. 2018;24(3):243–248. PMID: 28829155
- Langade D, Kanchi S, Salve J, et al. Efficacy and safety of ashwagandha (Withania somnifera) root extract in insomnia and anxiety: a double-blind, randomized, placebo-controlled study. Cureus. 2019;11(9):e5797. PMID: 31728244
- Lopresti AL, Smith SJ, Malvi H, Kodgule R. An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract: a randomized, double-blind, placebo-controlled study. Medicine (Baltimore). 2019;98(37):e17186. PMID: 31517876
- Chandrasekhar K, Kapoor J, Anishetty S. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian J Psychol Med. 2012;34(3):255–262. PMID: 23439798
- National Institute of Diabetes and Digestive and Kidney Diseases. Ashwagandha. LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. Bethesda (MD): NIH; updated 2024. NCBI Bookshelf NBK548536
- Therapeutic Goods Administration (Australia). Medicines containing Withania somnifera (ashwagandha) — safety advisory. February 2024.
Is Ashwagandha Good for Fatty Liver?
Limited data exists, and the picture is mixed. Some animal studies show ashwagandha's anti-inflammatory effects reduce hepatic fat. But a 2020 case series (PMID: 31991029) documented ashwagandha-associated liver injury, especially with concentrated high-dose extracts. If you have diagnosed fatty liver (NAFLD/NASH), do not add ashwagandha without consulting your hepatologist.
Is it Bad to Take Ashwagandha Everyday?
No. Daily use is the standard protocol, all clinical trials showing benefits used daily dosing for 8–12 weeks. Ashwagandha's mechanism involves gradual HPA-axis modulation, which requires consistent intake. Some practitioners recommend periodic cycling (8 weeks on, 2 off), but no study has proven tolerance develops. Daily dosing at 300–600 mg of standardized extract is safe and effective for healthy adults.
Can You Take Ashwagandha While Pregnant?
No. Ashwagandha is classified as an abortifacient in Ayurvedic medicine and should not be taken during pregnancy. Animal studies have shown that high doses can induce uterine contractions and increase the risk of miscarriage. No controlled human safety trial of ashwagandha during pregnancy has been conducted. The Natural Medicines Comprehensive Database rates ashwagandha as "likely unsafe" during pregnancy. If you are pregnant or planning to become pregnant, discontinue ashwagandha and consult your obstetrician before using any adaptogen.
Can You Take Ashwagandha While Breastfeeding?
There is insufficient safety data on ashwagandha during breastfeeding. No published study has measured whether ashwagandha compounds transfer into breast milk or what effects they might have on nursing infants. The precautionary principle applies: without evidence confirming safety, breastfeeding women should avoid ashwagandha supplementation. If you want adaptogenic support while nursing, discuss alternatives with your healthcare provider. Resume ashwagandha only after weaning is complete.
Is Ashwagandha Safe for Kids?
Ashwagandha has limited safety data in children. A small number of Ayurvedic pediatric studies have used ashwagandha in children aged 8–12 at low doses (300 mg/day) without reported adverse events, but these studies were short-term and not powered to detect rare side effects. No major Western regulatory body has specifically approved ashwagandha for pediatric use. If a parent is considering ashwagandha for a child, physician supervision is essential, and dosing should be conservative. For most children, ashwagandha supplementation is unnecessary since stress-management needs are better addressed through behavioral and environmental approaches.
Is Ashwagandha Bad for Your Liver?
At standard doses of 300–600 mg/day, ashwagandha has not been shown to cause liver damage in clinical trials lasting up to 12 weeks. However, post-market case reports have documented rare instances of herb-induced liver injury (HILI) associated with ashwagandha, typically at higher doses or with prolonged unsupervised use (Björnsson et al., 2020, PMID: 32540634). If you have pre-existing liver disease, elevated liver enzymes, or are taking hepatotoxic medications, consult your doctor before starting ashwagandha. Symptoms to watch for include yellowing of the skin or eyes, dark urine, or persistent upper-right abdominal pain.
Can You Take Ashwagandha With Zoloft?
There are no published clinical trials specifically testing the combination of ashwagandha and sertraline (Zoloft). The theoretical concern is that ashwagandha's GABAergic and serotonergic effects could interact with an SSRI, potentially increasing sedation or serotonin-related side effects. This is a theoretical interaction, not a confirmed one, but the absence of safety data means caution is warranted. Do not add ashwagandha to Zoloft without discussing it with the prescribing physician. If your doctor approves the combination, start at a low ashwagandha dose (300 mg/day) and monitor for increased drowsiness, mood changes, or GI symptoms.
This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not intended as medical advice.
| Metric | Value |
|---|---|
| GI upset / drowsiness | common, mild |
| Thyroid hormone rise | uncommon |
| Liver injury (case reports) | very rare |
| Safe daily ceiling (mg) | 600 KSM-66 |
| Safest extract type | root-only |
| Source: YourHealthier · controlled trials; root-only extract advised | |
Sources verified: All PubMed citations and external references in this article were last verified onJuly 03, 2026.
Disclosure: YourHealthier manufactures and sells the supplements discussed in this article. All health claims are based on published peer-reviewed research cited above. We earn revenue from product sales linked in this article.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.
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