The Dark Side of Ashwagandha: Risks & Side Effects (2026)

Ashwagandha has exploded from an ancient Ayurvedic remedy into one of the best-selling supplements in the world, credited with everything from lower cortisol to deeper sleep and higher testosterone. But interest in the ashwagandha dark side is growing just as quickly, and the concern is not unfounded. Regulators in Europe have restricted its sale, doctors have documented rare liver injuries, and users increasingly report unexpected mood changes. This evidence-based guide examines the full picture: how ashwagandha works in the body, which side effects are common and which are serious, who should never take it, how it interacts with common medications, and how to use it more safely if you decide it is right for you.

What Is Ashwagandha and Why Is It So Popular?

Ashwagandha (Withania somnifera) is a small evergreen shrub native to India, the Middle East, and parts of Africa. Its roots have been used for more than 3,000 years in Ayurvedic medicine, where it is classified as a rasayana, a rejuvenating tonic traditionally believed to promote longevity and resilience. The plant's active compounds, called withanolides, are steroidal lactones that appear to influence stress hormones, neurotransmitter signaling, and immune activity.

The name itself hints at its reputation. Somnifera translates roughly to sleep-inducing, and ashwagandha is widely described as an adaptogen, a term used for substances that supposedly help the body adapt to physical and psychological stress. Unlike stimulants that push energy up or sedatives that push it down, adaptogens are marketed as normalizers of the stress response, largely through effects on the hypothalamic-pituitary-adrenal (HPA) axis, the hormonal circuit that governs cortisol release.

Popularity surged when short clinical trials reported reductions in perceived stress and cortisol, and social media amplified claims about anxiety relief, better sleep, athletic recovery, and testosterone support. What the marketing rarely mentions is that most of these trials enrolled fewer than 100 people, lasted 8 to 12 weeks, and used different extracts at different doses. That gap matters, because safety data collected over 12 weeks tells you very little about what happens after a year of daily use.

Why Be Careful With Ashwagandha? The Short Answer

Ashwagandha is generally well tolerated at the doses used in studies, typically 125 to 600 milligrams per day of a standardized root extract. But well tolerated is not the same as risk-free, and the risks are not evenly distributed across users. Care is warranted because:

• Liver injury, while rare, is the most serious documented risk, with case reports from multiple countries describing hepatitis and jaundice.
• Thyroid hormones can rise with use, which is dangerous for people with hyperthyroidism and can destabilize those taking thyroid medication.
• Mood effects are unpredictable. Some users report emotional blunting or apathy instead of calm; others experience paradoxical anxiety, restlessness, or insomnia.
• Drug interactions are real. Sedatives, thyroid medication, diabetes drugs, blood pressure medication, and immunosuppressants can all be affected.
• Certain groups should avoid it entirely, including pregnant women and many people with autoimmune disease.
• Product quality varies widely, with documented problems involving contamination, mislabeling, and inconsistent withanolide content.
• Long-term safety data beyond three months barely exist.

None of this means ashwagandha is dangerous for everyone. It means the risk-benefit calculation is personal, depending on your health status, your medications, the dose, the product, and how long you take it. The sections below break each risk down in detail.

Common Side Effects: Stomach Upset, Diarrhea, Nausea, and Drowsiness

The most frequently reported ashwagandha side effects are mild and digestive. Nausea, stomach upset, loose stools, and diarrhea appear consistently in trial data, usually at higher doses or when the supplement is taken on an empty stomach. Taking it with food often reduces these effects, though it does not eliminate them for sensitive individuals.

Drowsiness is the second common complaint. Ashwagandha has measurable sedative properties in some people, which is part of why it is marketed for sleep. That same effect becomes a problem if you drive, operate machinery, or combine it with alcohol, sleep medications, or other calming substances. Users sometimes describe heavy grogginess the next morning, particularly at higher evening doses.

Other reported effects include headache, dry mouth, and mild dizziness. These tend to be dose-dependent, which is worth remembering: a person tolerating 300 milligrams per day may not tolerate 600. Individual biological variability is substantial here. Differences in metabolism, gut sensitivity, baseline stress hormone levels, and even genetics can make the same capsule produce calm in one person and symptoms in another.

If mild side effects persist beyond the first week or two, that is a signal to reassess rather than push through. Persistent symptoms deserve a conversation with a clinician, particularly since they may have causes unrelated to the supplement.

Liver Injury: The Most Serious Documented Risk

Rare cases of ashwagandha-associated liver injury are now documented in the medical literature and in the NIH LiverTox database, which catalogs hepatotoxicity from drugs and supplements. The reported pattern is typically cholestatic or mixed hepatitis, meaning the injury affects both liver cells and bile flow. Onset usually occurs within two weeks to three months of starting, at doses well within the range sold online.

Symptoms of supplement-related liver injury overlap with ordinary illness, which is what makes them easy to miss:

• Fatigue and weakness that seem disproportionate
• Nausea or loss of appetite
• Itching, often without a rash
• Dark urine or pale, clay-colored stools
• Yellowing of the skin or eyes (jaundice)
• Discomfort in the upper right abdomen

The encouraging news is that most documented cases improved after the supplement was stopped, with liver enzymes normalizing over weeks to months. The less encouraging news is that some cases were severe enough to require hospitalization, and isolated reports describe serious outcomes. Because millions of people use ashwagandha, a small number of cases may sound negligible, but hepatotoxicity from a wellness product is inherently alarming, and the true incidence is unknown since most users never have liver tests done.

Scientists are still debating the mechanism. Possibilities include direct toxicity from withanolides, immune-mediated injury, or contamination and adulteration of specific products rather than the herb itself. Some researchers have questioned whether leaf-containing extracts, which carry higher concentrations of the biologically potent withaferin A, account for a disproportionate share of cases. That remains a hypothesis rather than a conclusion, and it is one more reason product selection matters.

Anyone with existing liver disease, elevated liver enzymes, or heavy alcohol use should not take ashwagandha without medical supervision, and anyone who develops the symptoms above should stop immediately and have liver enzymes checked.

Thyroid Effects: Hormone Changes and Thyrotoxicosis Risk

When people ask what organ ashwagandha is hard on, the answer is the liver first and the thyroid second. Ashwagandha has measurable effects on thyroid hormones. Small trials have shown increases in triiodothyronine (T3) and thyroxine (T4), and one trial in people with subclinical hypothyroidism reported normalization of thyroid values, which is precisely why the herb gets marketed for thyroid support. The mechanism is not fully understood but appears to involve stimulation of thyroid hormone production.

That endocrine activity is a double-edged sword. Case reports describe thyrotoxicosis, essentially a temporary overactive thyroid, in people taking ashwagandha, with symptoms including a racing heart, anxiety, tremor, heat intolerance, unexplained weight loss, and insomnia. For someone with Graves disease or existing hyperthyroidism, adding ashwagandha could meaningfully worsen their condition. For someone taking levothyroxine, the combination could push thyroid hormone levels too high, producing the same over-replacement symptoms doctors work hard to avoid.

The Denmark Ban and European Regulatory Scrutiny

The most significant regulatory development came from Denmark. In 2023, following a risk assessment by the National Food Institute at the Technical University of Denmark (DTU), the Danish Veterinary and Food Administration moved to prohibit ashwagandha in food supplements. The DTU concluded that doses commonly sold could not be demonstrated safe, citing both the documented liver injury reports and the potential for thyroid hormone disruption. Denmark effectively became the first country to remove ashwagandha supplements from its market over safety concerns.

Context matters here. A national risk assessment is not proof that ashwagandha harms most users; it reflects a precautionary standard applied to products consumed daily by healthy people without medical oversight. Elsewhere in Europe, the European Medicines Agency recognizes ashwagandha root as a traditional herbal medicinal product for relief of stress symptoms, but that status involves defined extraction methods, defined doses, and short-duration use, far narrower than the open-ended daily dosing common in the supplement market. For consumers, the Danish decision is a signal that credible regulators see meaningful uncertainty at typical supplement doses.

The Mental Dark Side: Emotional Blunting, Apathy, and Paradoxical Anxiety

One of the most underreported aspects of ashwagandha is not in the clinical trials at all. It lives in thousands of user reports across Reddit, TikTok, and online forums: people describing a flattening of emotion rather than relief from stress. The vocabulary repeats with striking consistency, including emotional blunting, apathy, anhedonia, feeling robotic, and loss of motivation or drive. Some describe it as their personality going quiet.

No formal clinical research has measured emotional blunting from ashwagandha, so this remains anecdotal. But the reports are biologically plausible. Ashwagandha appears to dampen HPA axis reactivity and lower cortisol, and it may modulate GABA signaling, the same neurotransmitter system targeted by many calming drugs. Any substance that reliably turns down the volume on the stress response can, in some people, turn down other emotional volume too. Variability in baseline cortisol, receptor sensitivity, and underlying mental health likely explains why one person gets calm and another gets numb.

The opposite reaction also occurs. A smaller but consistent group of users report paradoxical effects: instead of calm, they feel stimulated, wired, irritable, or more anxious, sometimes with insomnia and palpitations. This may reflect differences in how people metabolize withanolides, underlying thyroid tendencies that ashwagandha can amplify, or simple individual activation from any new biologically active substance.

Three practical points follow. First, if you notice emotional numbness, loss of interest in things you used to enjoy, or a flat mood after starting ashwagandha, take it seriously and consider stopping. Second, symptoms alone are an unreliable guide to root causes: low mood and fatigue can also stem from nutrient deficiencies, thyroid dysfunction, poor sleep, or depression itself, which is why persistent changes deserve proper evaluation rather than self-diagnosis. Third, ashwagandha is not a substitute for evidence-based mental health care, and anyone taking psychiatric medication should discuss it with their prescriber before adding it.

What Should You Never Mix With Ashwagandha?

Ashwagandha interacts with several common medication classes, either by amplifying their effects or working against them. The table below summarizes the major concerns. It is not exhaustive, which is exactly why you should show the supplement label to your pharmacist or doctor if you take any prescription medication.

Medication or Substance	Possible Interaction	What It Could Mean
Thyroid medication (levothyroxine, liothyronine)	Additive increase in thyroid hormone levels	Over-replacement symptoms: palpitations, anxiety, tremor, insomnia
Sedatives and sleep drugs (benzodiazepines, zolpidem, melatonin)	Additive central nervous system depression	Excessive drowsiness, impaired coordination and concentration
Alcohol	Additive sedation plus added metabolic burden on the liver	Increased impairment and possible added liver stress
SSRIs, SNRIs, and other serotonergic drugs	Theoretical serotonergic effects; limited human data	Caution advised regarding excessive serotonergic activity, sometimes discussed in terms of serotonin syndrome risk
Immunosuppressants (prednisone, tacrolimus, cyclosporine, biologics)	Ashwagandha may stimulate immune activity, opposing immunosuppression	Potential reduced treatment effectiveness, a serious concern after transplant or with autoimmune disease
Diabetes medications (insulin, metformin, sulfonylureas)	Additive blood-sugar lowering	Hypoglycemia: shakiness, sweating, confusion
Blood pressure medications	Additive blood-pressure lowering	Dizziness, lightheadedness, fainting risk
Anticonvulsants	Limited data; possible sedation and unknown effects on seizure control	Medical guidance essential before combining

Two additional cautions. Early laboratory research suggests ashwagandha may affect liver enzymes, including CYP3A4, that metabolize many drugs, meaning interaction potential may extend beyond this list. And combining ashwagandha with other substances that stress the liver, or with other sedating herbs such as valerian and kava, stacks risks without evidence of safety.

Who Should Not Take Ashwagandha?

For some groups, the risk-benefit calculation is not close. Ashwagandha should be avoided by:

• Pregnant women. Traditional sources and animal research raise concerns that ashwagandha could stimulate uterine contractions, and there are no adequate human safety studies in pregnancy.
• Breastfeeding women. There is no reliable data on whether withanolides pass into breast milk or how they affect infants.
• People with hyperthyroidism or Graves disease. The thyroid-stimulating effects could worsen the condition.
• People with autoimmune conditions such as lupus, rheumatoid arthritis, Hashimoto thyroiditis, multiple sclerosis, or type 1 diabetes. Because ashwagandha appears to stimulate immune activity, it could theoretically counteract disease control or immunosuppressive treatment.
• People with liver disease or elevated liver enzymes. Existing injury plus a hepatotoxicity signal is a combination to avoid.
• People with hormone-sensitive cancers, including prostate cancer, unless their oncologist explicitly approves, given possible effects on testosterone.
• People scheduled for surgery. Sedative and blood-pressure effects make it standard advice to stop ashwagandha at least two weeks before any procedure.
• Children. Safety data in minors is insufficient.

If you have any chronic condition or take any daily medication, the correct first step is a conversation with a clinician or pharmacist, not a purchase. That single step eliminates most preventable problems.

Male and Female-Specific Risks

Ashwagandha Side Effects for Men

Much of ashwagandha's recent growth came from male-focused marketing around testosterone, muscle, and fertility. Some small trials do support modest testosterone increases and improved sperm parameters in men under stress. What the marketing omits is that long-term hormonal effects are unknown. Elevating a hormone chronically, even modestly, is not automatically benign. Theoretical concerns include acne and hair changes in susceptible individuals, and for men with or at elevated risk for prostate cancer, any testosterone-elevating substance warrants oncologist input.

Some male users also report increased irritability, aggression, or restlessness, anecdotally consistent with its stimulating effects in certain people. And men exploring it for fertility should note that the supporting studies involved supervised treatment of diagnosed infertility, not optimization use in healthy men.

Ashwagandha Side Effects for Women

For women, the dominant issues are hormonal and reproductive. Ashwagandha is firmly contraindicated in pregnancy and while breastfeeding, as noted above. Beyond that, some women report menstrual cycle changes, including irregular periods, though these reports are anecdotal and unstudied. Because of possible hormone and thyroid effects, women with thyroid disorders, polycystic ovary syndrome under medical treatment, endometriosis, or hormone-sensitive conditions should involve their gynecologist or endocrinologist before use. Women taking oral contraceptives or hormone therapy should also flag the supplement to their prescriber, since effects on thyroid function and liver metabolism could theoretically influence overall hormone balance.

Is Ashwagandha Addictive? Dependence and Stopping

By standard definitions, ashwagandha is not addictive. It does not produce the reward-driven craving or compulsive use pattern characteristic of addictive substances, and there is no recognized withdrawal syndrome. Most people who stop simply return to baseline over days to weeks.

That said, an honest answer requires nuance. Clinical trials have mostly run for 6 to 12 weeks, so there is little formal data on stopping after a year or more of daily use. Some long-term users anecdotally describe a difficult adjustment period after quitting, including rebound anxiety, poor sleep, or low mood. It is unclear whether this reflects true physiological adaptation, the return of the original stress or insomnia problem, or psychological reliance on a routine.

Practical guidance for stopping:

• Short-term users can usually stop directly without issue.
• Long-term or high-dose users may prefer a gradual reduction over one to two weeks, which is simple and low-risk.
• Track what happens afterward. If anxiety or insomnia returns strongly, that is useful clinical information pointing to an underlying issue worth treating properly rather than indefinitely masking.
• If you used ashwagandha alongside prescribed medication, involve the prescribing clinician in any changes.

Why Don't Doctors Recommend Ashwagandha?

The question comes up constantly, and the answer is less dramatic than many assume. Physicians generally hesitate to recommend ashwagandha for four reasons.

First, the evidence, while promising, is thin. Trials are small, short, and use varied extracts and doses, making results hard to generalize. Second, supplements in the United States are not approved by the FDA before sale. Under current law, manufacturers are responsible for their own safety, and regulators act mainly after problems emerge. Doctors know that what the label says and what the bottle contains may differ. Third, the interaction and special-population risks described above are genuine and vary from patient to patient. Fourth, for conditions like anxiety, insomnia, and thyroid dysfunction, treatments with far stronger evidence and predictable dosing already exist.

That said, many clinicians are not rigidly opposed. A healthy adult with mild stress, no medications, normal liver function, and a third-party-tested product is a very different situation from a patient on five medications with thyroid disease. The worst outcome is a patient who hides supplement use from their doctor. Transparency lets the people managing your health see the whole picture.

Supplement Quality: Adulteration, Mislabeling, and How to Choose Safer Products

Quality is arguably the most underrated safety variable in the entire ashwagandha conversation, and it is where generic guides rarely go deep.

Root versus leaf: why the difference matters

Traditional Ayurvedic practice uses the root, and most clinical trials tested standardized root extracts. Some cheaper products use whole-plant or leaf-containing extracts, which carry notably higher concentrations of withaferin A, a withanolide with potent cytotoxic activity in laboratory research. Whether leaf content contributes to the liver injury cases is unproven but debated, and consumers often miss the distinction on labels. Reading closely for root extract and checking the withanolide standardization, commonly 2.5 to 5 percent, is a meaningful step.

Contamination and mislabeling

Independent analyses of ashwagandha products have found instances of heavy metal contamination, including lead, along with products containing less active compound than labeled. Adulteration is a documented problem across the botanical supplement market. Because ashwagandha can affect the liver and thyroid, contaminated or mislabeled versions carry risks beyond simple ineffectiveness.

How to choose a safer product

• Look for third-party certification from USP or NSF International, or verification by ConsumerLab, which independently test identity, potency, and purity.
• Prefer standardized root extracts from established manufacturers with transparent sourcing.
• Be skeptical of proprietary blends that hide individual amounts, and of prices that seem impossible.
• Check batch-level certificates of analysis when brands publish them.

Certification does not make a supplement effective, and it does not remove the medical risks discussed above. It narrows one specific risk: that the product is not what it claims to be.

Red-Flag Symptoms: When to Stop and See a Doctor

Because self-monitoring is the main safety system most supplement users actually have, it helps to sort symptoms into two categories.

Stop immediately and seek urgent medical care if you experience:

• Yellowing of the skin or eyes, dark urine, pale stools, or severe itching, which can indicate liver injury
• Racing heartbeat, tremor, severe anxiety, heat intolerance, or unexplained weight loss, which can indicate thyrotoxicosis
• Swelling of the face, lips, or throat, hives, or difficulty breathing, which can indicate a serious allergic reaction
• Worsening depression or thoughts of self-harm, which require immediate professional support

Stop and schedule a medical review promptly if you notice:

• Persistent nausea, right-upper abdominal pain, or unusual fatigue lasting more than a few days
• New palpitations, sleep disruption, or heat sensitivity
• Emotional blunting, apathy, or loss of interest that does not resolve after stopping
• Any symptom that is new, unexplained, and persistent, since symptoms alone rarely reveal their root cause

In the United States, Poison Control (1-800-222-1222) offers free, immediate guidance on supplement-related adverse effects. When in doubt, ask, and keep the product bottle on hand, since the exact extract and batch matter for evaluation.

Safer Use Guidelines: Dose, Duration, and Monitoring

For adults who clear the contraindication list and still want to try ashwagandha, harm reduction looks like this:

• Stay within studied doses. Most evidence supports 300 to 600 milligrams per day of a standardized root extract, divided or once daily. Start at the low end. Megadoses have no supporting data.
• Limit duration. Safety data beyond roughly three months is sparse. Consider a defined trial period, such as eight to twelve weeks, followed by an honest reassessment of whether it is helping.
• Time it thoughtfully. Evening dosing suits sleep-focused use but may compound morning grogginess; taking it with food reduces stomach upset.
• Get baseline labs if you have risk factors. Anyone with a history of liver issues, thyroid conditions, heavy alcohol use, or relevant medications should ask their doctor about baseline liver enzymes and thyroid function, with periodic rechecks during use.
• Buy third-party tested products from USP, NSF, or ConsumerLab-verified sources, favoring root extracts.
• Do a medication check first. A pharmacist can screen your complete medication and supplement list in minutes.

One more consideration that rarely appears in ashwagandha discussions: it is not a nutrient, and no one is deficient in it. Before adding a hormonally active botanical, it is worth confirming that basic nutritional foundations are covered, because hidden nutrient gaps can quietly mimic the very problems ashwagandha is taken for. Low magnesium status is common and closely tied to sleep quality, muscle tension, and stress resilience, which is why magnesium support for sleep and stress is often a more conservative first step. Vitamin D insufficiency is widespread and relevant to immune and thyroid function, making vitamin D status worth checking before reaching for anything with endocrine activity. Vitamin C also plays a documented role in the stress response, since the adrenal glands concentrate it during cortisol production, and vitamin C and antioxidant support through diet or supplementation addresses a need the body actually has. For readers who want a simpler baseline, a well-formulated multivitamin can fill common nutrient gaps without the pharmacological profile of an adaptogen.

As a general principle, people who benefit most from supplements are those with documented or likely shortfalls: restrictive diets, low sun exposure, older adults, and anyone with conditions or medications that deplete nutrients. Botanicals like ashwagandha belong to a different category, closer to weak drugs than to nutrients, and deserve correspondingly more caution.

Conclusion: A Balanced View of the Ashwagandha Dark Side

Ashwagandha is neither the miracle some creators promise nor the poison fear-driven content suggests. It is a biologically active substance with genuine effects on cortisol, thyroid hormones, and the nervous system, which is exactly why it can help some people and harm others. The documented record includes millions of tolerated users and, simultaneously, rare liver injuries, thyroid disruptions, mood changes, and regulatory action in Denmark. The honest summary is that meaningful benefits for some come packaged with real, unevenly distributed risks, limited long-term data, and a supply chain of uneven quality.

If you take one idea from this guide, let it be this: individual variability is the rule, not the exception. Your biology, your medications, your baseline mental health, and the product in your bottle all change the risk calculus. Approach ashwagandha the way good clinicians approach any active compound: lowest effective dose, defined duration, awareness of red-flag symptoms, third-party verification, and honest communication with a healthcare professional who knows your history.

Key Takeaways

• Ashwagandha is well tolerated by most users at 125 to 600 mg per day, but well tolerated does not mean risk-free, and long-term safety data beyond three months is limited.
• Liver injury is the most serious documented risk: rare, but real, with case reports of jaundice and hepatitis that usually resolve after stopping.
• Ashwagandha raises thyroid hormones and can trigger thyrotoxicosis; it should not be combined with thyroid medication or used with hyperthyroidism without medical supervision.
• Denmark restricted ashwagandha supplements in 2023 after the Danish Technical University risk assessment concluded that typical doses could not be shown safe.
• User reports describe emotional blunting, apathy, and paradoxical anxiety in some people; anecdotal, but plausible given ashwagandha's effects on cortisol and GABA signaling.
• Major interactions include sedatives, thyroid medication, diabetes drugs, blood pressure medication, and immunosuppressants; alcohol should be avoided.
• Pregnant and breastfeeding women, people with autoimmune disease, liver disease, hormone-sensitive cancers, and those awaiting surgery should not take ashwagandha.
• Men face uncertain long-term hormonal effects; women face pregnancy contraindications and possible menstrual changes.
• Product quality varies widely; choose USP, NSF, or ConsumerLab-tested root extracts to reduce contamination and mislabeling risk.
• Red-flag symptoms such as jaundice, racing heart, allergic swelling, or worsening mood require stopping immediately and seeking medical care.

Frequently Asked Questions

Why be careful with ashwagandha?

Because its effects are biologically real and not uniformly benign. Documented risks include rare liver injury, thyroid hormone elevation, interactions with sedatives and other common medications, and mood changes such as emotional blunting or paradoxical anxiety. Certain groups, including pregnant women and people with autoimmune or thyroid disease, should avoid it entirely.

What organ is ashwagandha hard on?

The liver and the thyroid. Rare case reports describe liver injury with jaundice, typically resolving after discontinuation, while trials and case reports show ashwagandha can raise thyroid hormone levels, occasionally triggering temporary thyrotoxicosis.

What should you never mix with ashwagandha?

Thyroid medication, sedatives and sleep drugs, alcohol, immunosuppressants, diabetes medications, and blood pressure medication top the list. Combining it with serotonergic antidepressants also warrants caution. A pharmacist can check your full medication list in minutes.

Why don't doctors recommend ashwagandha?

Mainly because the evidence base is small and short-term, supplements are not FDA-approved for safety and efficacy before sale, product quality varies widely, and stronger-evidence treatments exist for most conditions it targets. Many doctors remain open to cautious, supervised use in low-risk patients who are transparent about it.

Can ashwagandha cause liver damage?

Rarely, yes. Case reports and the NIH LiverTox database document clinically significant liver injury associated with ashwagandha, usually within weeks to months of starting. Most cases resolved after stopping, but symptoms such as jaundice, dark urine, or itching should prompt immediate discontinuation and medical evaluation.

Does ashwagandha affect thyroid hormones?

Yes. Studies show increases in T3 and T4, and a small trial in subclinical hypothyroidism found thyroid values normalized. That same activity can cause thyrotoxicosis in susceptible people and can push levels too high when combined with levothyroxine.

Is ashwagandha addictive?

No, not by standard definitions. It does not produce craving, tolerance, or a recognized withdrawal syndrome. Some long-term users anecdotally report rebound anxiety or sleep trouble after stopping, but whether that reflects physiological adaptation or the return of the original problem is unclear.

Can ashwagandha make anxiety worse?

In some people, yes. Paradoxical reactions featuring restlessness, insomnia, palpitations, and increased anxiety are reported anecdotally, and the effect may be amplified in people with thyroid tendencies. If anxiety worsens after starting, stopping is a reasonable first step.

Can ashwagandha cause emotional numbness?

Emotional blunting and apathy are among the most commonly reported negative experiences in user communities, though no clinical trial has formally measured them. The effect is plausibly related to dampened cortisol and stress signaling. If you feel flat, unmotivated, or detached, stop and see whether it resolves.

Is ashwagandha safe to take every day long term?

Unknown. Controlled trials extend to roughly three months, and safety beyond that is not established. Given the liver and thyroid signals, indefinite daily use without monitoring is not advisable, especially for anyone with risk factors.

Can I take ashwagandha while pregnant or breastfeeding?

No. There are no adequate safety studies in pregnancy, traditional sources suggest possible uterine-stimulating effects, and there is no reliable data on transfer into breast milk. Both situations call for complete avoidance.

What are signs ashwagandha isn't right for me?

Persistent stomach problems, new drowsiness that interferes with daily life, worsening anxiety or insomnia, emotional numbness, palpitations, dark urine, itching, or yellowing skin. Any of these justify stopping, and the last three warrant prompt medical attention.

Reviewed by the Topvitamine health editorial team for medical accuracy. Last updated January 2026. This article is for informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before starting, stopping, or combining any supplement, especially if you are pregnant, taking medication, or managing a health condition.

Keywords: ashwagandha dark side, ashwagandha side effects, is ashwagandha safe, ashwagandha dangers, who should not take ashwagandha, Withania somnifera, adaptogen, withanolides, liver injury, hepatotoxicity, jaundice, thyroid hormones, thyrotoxicosis, cortisol, HPA axis, levothyroxine interaction, immunosuppressants, sedatives, emotional blunting, paradoxical anxiety, anhedonia, Denmark ashwagandha ban, Danish Technical University report, third-party testing, USP verified, NSF certified, Ayurvedic medicine, long-term safety, discontinuation, supplement quality, pregnancy warnings, prostate cancer risk, autoimmune conditions, serotonin syndrome risk, herb-drug interactions