15 Serious Side Effects Of Ashwagandha & Precautions To Take

From liver damage to dry mouth, this medicinal herb may have some unpleasant effects.

Medically reviewed by Madhu Sharma, RD Madhu Sharma Madhu SharmaRD
Written by , Health & Wellness Writer Varsha Patnaik Health & Wellness Writer Experience: 2 years
Edited by , Senior Editor Ravi Teja Tadimalla Senior Editor Experience: 8 years
Fact-checked by , Senior Health & Wellness Writer Payal Karnik Senior Health & Wellness Writer Experience: 2.5 years

Ashwagandha is one of the most used herbs in Ayurveda. It is scientifically known as Withania Somnifera. While it offers an array of health benefits, the side effects of ashwagandha are also documented. In people with allergies or autoimmune diseases, ashwagandha may cause adverse effects as it has immunomodulatory and hypoglycemici  XA property characterized by blood sugar levels that fall below the healthy range, causing sweats, chills, and tremors. properties. There is also some evidence that it may cause abortions. In this article, you will read more about such negative effects of this herb. Scroll down to know more about Ashwagandha’s side effects.

protip_icon Know The Flip Side: Ashwagandha

Short-Term Effects
May cause drowsiness, headache, stomach upset, or excessively low blood sugar levels.

Long-Term Effects
Liver health might be affected in certain circumstances.

Drug Interactions
May interact with medications that suppress the immune system responses or are used to treat insomnia as well as medication for lowering blood pressure.

When To See A Doctor
If you experience an allergic reaction such as rashes, difficulty in breathing, and chest pain.

Uses Of Ashwagandha

Ashwagandha is a herb with a lot of significance in the Ayurvedic tradition. It has a range of valuable applications. It serves as a potent adaptogen that aids in stress and anxiety management and is used to promote overall emotional well-being.

It promotes better sleep quality and cognitive function. Further, it is rich in antioxidants which help protect against oxidative damage and reduce the risk of chronic diseases, while its anti-inflammatory properties make it a natural remedy for conditions such as arthritis and muscle pain (1). Anecdotal evidence suggests it may also help strengthen the immune system.

Nevertheless, excessive usage may lead to a host of negative effects as discussed below.

What Are The Side Effects Of Ashwagandha?

1. May Be Harmful During Pregnancy And Breastfeeding

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Ashwagandha is one of those herbs that can harm the baby or terminate pregnancy. According to reports by the Sloan-Kettering Memorial Cancer Center, ashwagandha can induce abortion (2).

Ashwagandha side effects for females may also cause miscarriages. There is little information on the safety of ashwagandha during breastfeeding. Hence, stay on the safe side and avoid its use.

protip_icon Trivia
Ashwagandha combines two Sanskrit words – ‘ashwa,’ meaning horse, and ‘gandha,’ meaning smell. This alludes to the strong horse-like odor of the herb.

2. May Cause Liver Damage

Patients taking commercial herbal products containing ashwagandha were found to experience liver injuries (3). However, the herb’s mechanism in this regard is yet to be understood.

3. May Lower Blood Sugar Way Too Much

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Studies show that ashwagandha can lower blood sugar levels (4). However, this may not be beneficial to someone on diabetes medication. The herb may lower blood sugar levels way too much. These changes in the blood sugar level can cause other complications.

Studies showed hypoglycemici  XA property characterized by blood sugar levels that fall below the healthy range, causing sweats, chills, and tremors. effects and effects on insulin sensitivity in diabetic rats (5), (6). Hence, those on diabetes medications may experience adverse effects with the intake of ashwagandha.

4. May Aggravate Hyperthyroidism

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Ashwagandha is known to increase thyroid hormone concentrations. Hence, those with hyperthyroidism may experience undesirable symptoms (7). Hyperthyroidism is a condition characterized by excess levels of thyroid hormones in the serum.

Individuals diagnosed with hypothyroidism (underactive thyroid) must also consult their doctor before taking ashwagandha as the herb may interact with the associated medications and bring changes in thyroid hormone levels.

5. May Aggravate Autoimmune Diseases

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Ashwagandha extract is known to boost the immune system (8). This property may be a problem for individuals diagnosed with autoimmune disorders, like rheumatoid arthritis, lupus, and multiple sclerosis. Medications taken for treating autoimmune diseases decrease immune system response, and supplementing them with ashwagandha may interfere with their effectiveness. More research is needed to understand the mechanism of ashwagandha on autoimmune diseases.

6. May Cause Gastrointestinal Issues

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Excess ashwagandha may irritate the gastrointestinal tract (3). Hence, those with stomach ulcers are suggested to avoid the herb. Constipation was another side effect seen in a group that took ashwagandha (9). The herb may also cause diarrhea and an upset stomach (3).

7. May Cause Drowsiness

It may cause changes in sleep patterns. In rat studies, ashwagandha was found to have relaxing properties that might lead to drowsiness (10). Hence, someone on medications for insomnia may experience excessive sleepiness with the herb intake.

Ensure you don’t use the herb in conjunction with sleep medications like lorazepam, zolpidem, or alprazolam. Though the research about herb-drug interactions is limited, it is important to exercise caution.

Studies have also confirmed the sleep-inducing properties of ashwagandha (11). Taking the herb along with sedatives may lead to excessive drowsiness. Hence, consult your doctor.

8. May Lead To Erectile Dysfunction

It can cause negative changes in sexual function. As per researchers from the University of Ruhuna, ashwagandha root extract may cause erectile dysfunctioni  XA condition experienced by certain men that is characterized by the inability to keep an erection long enough to engage in sexual activity. and decrease male sexual performance (12). Though the herb is believed to be an aphrodisiaci  XSubstances used to stimulate and increase sexual desire, pleasure, and arousal, which are abundant in almonds and pumpkin seeds. , this is something to be considered. More research on humans is needed to understand this phenomenon further.

9. May Causes Allergies

Allergic reactions have been reported anecdotally among some individuals who have taken ashwagandha. The reactions may include skin rashes, itchiness, inflammation, chest pain, dizziness, headache, and difficulty in breathing. People allergic to nightshades may also be allergic to ashwagandha. However, we need more research on this.

10. May Cause Fever

The use of ashwagandha may increase body temperature in some individuals. However, how this happens is yet to be understood. The elevated body temperature is said to return to normal in a few days. Information on this aspect is insufficient. If you have a high body temperature for any reason, consult your doctor before taking ashwagandha.

11. May Cause Bleeding

Ashwagandha may cause bleeding. Individuals with bleeding disorders are not recommended to take the herb. However, no concrete research supports this, except for anecdotal evidence.

12. May Cause Dry Mouth

Intake of excess ashwagandha may cause dry mouth in certain individuals. Though there is not enough research, it is better to exercise caution and consult your doctor if the condition arises.

Most of the side effects of ashwagandha are based on anecdotal evidence. While more research is ongoing, it is important to take precautions.

13. May Cause Kidney Damage

It may cause negative changes in kidney function. As per research, with its immunostimulatory effects, ashwagandha may lead to kidney allograft rejection (13). Therefore, people considering a kidney transplant should consult their doctor about the same.

14. May Lower Blood Pressure

While ashwagandha on its own might be beneficial for people with hypertension, its ability to lower blood pressure could prove fatal if combined with other hypertension-lowering drugs and medications. In addition, it could also prove dangerous for people with low blood pressure conditions (14). That’s why it is essential to consult a doctor before adding it to your wellness regimen, especially if you have any pre-existing conditions related to changes in blood pressure.

15. May Induce Drug Interactions

If you are on any medication, you should consult a doctor before you include Ashwagandha in your wellness routine. Ashwagandha may result in drug interactions, especially with sedatives, liver medications, diabetes, thyroid, cholesterol, or hypertension-related medications (5), (10), (11), (3),(8), (7). It may also cause changes in the immune system as it may interact with immunosuppressants.

Ashwagandha may also cause other side effects. Mary Sabat, MS, RD, LD, says, “Even though ashwagandha is thought of as a calming herbal supplement, it may cause anxiety in some people. In Ayurvedic medicine, it is believed that the ashwagandha’s heating energy may cause anxiety in some people due to its stimulating effects. The herb is also known to increase energy levels, alertness, and activity, which can be overwhelming for people who are prone to anxiety. Additionally, ashwagandha can also increase cortisol and adrenaline levels, both of which are hormones associated with stress.”

Mary Sabat adds, “Herbal supplements can be potent and work like drugs in the body. For most people, this herb is an adaptogen and helps with stress and sleep but for others, it could have the opposite effect leading to anxiety and possibly weight gain.”

Youtuber Dr. Dallin LeGrand Peterson, ND, took ashwagandha supplements for 30 days to help manage ADHD and documented his experience. He noticed that by the 2nd week he began to experience feelings of depression and reduced motivation, which was unusual for him. “By week four, it was a problem that I just could not keep on doing this (i).” The negative impact on their mood, energy, and motivation became a significant issue, leading them to consider discontinuing ashwagandha. “Really my final thoughts when taking ashwagandha for 30 days…it certainly wasn’t for me.”

Given the above side effects of ashwagandha, it is essential to consult a licensed medical practitioner before taking this herb in any form. Also, there are certain health conditions and situations wherein you should avoid ashwagandha altogether.

Who Should Not Take Ashwagandha

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You should not include ashwagandha in your wellness routine in any form if you are dealing with any of the below health conditions.

  • Pregnancy: Ashwagandha has not been widely studied for its effects on human pregnancies. It is therefore advised to avoid its consumption when pregnant.
  • Hyperthyroidism: Ashwagandha may alter the normal functioning of the thyroid and may increase the thyroid hormones. This could be dangerous for people with hyperthyroidism (15). It may also interfere with the results of thyroid tests, so it’s important to inform your doctor if you are taking ashwagandha in any form.
  • Prostate Cancer: Ashwagandha may potentially increase your serum testosterone levels which could be dangerous for people with prostate cancer (16).
  • An Autoimmune Condition: Ashwagandha has immunostimulating properties, which can help boost the immune system (7). This may decrease the effects of immunosuppressant drugsi  XDrugs that suppress the immune system when it mistakenly attacks healthy cells and tissues, particularly a transplanted foreign organ. generally used for managing autoimmune disorders.
  • Diabetes: Animal studies suggest that Ashwagandha may decrease blood sugar levels (5), (6). While it’s still not yet established for humans, people with diabetes should consult with their doctor before taking ashwagandha.
  • Liver Concerns: Ashwagandha, beyond its prescribed dose, may affect your liver health or aggravate pre-existing liver conditions (3). So you should consult your doctor before including it in your routine.
  • Impending Surgery: In case of an upcoming surgery that requires anesthesia, you should stop taking ashwagandha at least two weeks ahead to avoid any potential drug interactions (17).

While most of the risks of ashwagandha may seem to be based on anecdotal evidence, it is still important to take precautions to avoid any adverse effects.

Precautions To Be Taken

It is important to take ashwagandha in the right dosage. Strictly follow medical advice to prevent any adverse reactions. Certain other precautions that one must take include the following:

  • Ashwagandha root extract should be used only as a supplement as it is non-toxic in comparison to Withaferin A (the anticancer molecule).
  • It is advisable to take ashwagandha with meals (or breakfast) with a full glass of water.
  • As ashwagandha may increase the effects of certain drugs or medications, it is important to review the drugs or medications that you are taking before consuming them.
  • Those who experience abdominal disorders after using ashwagandha should consult their doctor. Large doses of ashwagandha may cause stomach upset, diarrhea, and vomiting.

The ideal dosage of ashwagandha would be suggested by your doctor or healthcare provider. However, there are some recommendations you may want to know.

Recommended Dosage

  • Powder (leaf): 1-2 teaspoons a day
  • Root: 1-2 teaspoons a day
  • Capsule: 1-6 g of the whole herb (by mouth) per day
  • Tea: 3 cups of the whole herb per day (1-6 g)
  • Tincture: 2-4 mL (by mouth), thrice a day

protip_icon Quick Tip
You can add honey, tulsi, turmeric, ginger, cardamom, or lemon to cut through the bitter taste of your ashwagandha tea.

Exceeding the dosage may cause side effects. There is less research to substantiate these dosage values. You may talk to your doctor for the exact dosage for you.

Infographic: What To Look For In Ashwagandha Supplements?

Ashwagandha is a widely used herb with many medicinal values. However, it also may cause side effects. Consuming contaminated or poor-quality products made of this herb may harm one’s health. The good news is – considering certain factors beforehand can help minimize the risk of these negative effects. Click on the infographic below to learn how to prevent ashwagandha gummies’ side effects.

what to look for in ashwagandha supplements (infographic)

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Ashwagandha is a popular herb with many medicinal properties. It has been used for treating many ailments and has a long history in alternative medicine. However, one must also be aware of some of the side effects of ashwagandha. Excess intake of this herbal remedy may induce abortion, changes in the liver function, lower blood sugar levels way too much, aggravate hyperthyroidism, and lead to autoimmune disease. Also, if you want to opt for ashwagandha supplements, get them from a reliable manufacturer. As it is not suitable for everyone, consult your doctor before using this herb.

Frequently Asked Questions

Can ashwagandha cause weight gain?

While no research yet states that ashwagandha can cause weight gain, one particular study suggests that the herb may help with weight management in adults dealing with chronic stress (18).

Can I take ashwagandha in the morning?

Yes, ashwagandha is an adaptogen and can be taken in the morning to help combat fatigue, stress, and positive changes in mood or behavior positively. However, it’s important to note that everyone reacts differently to supplements.

Should you take ashwagandha on an empty stomach?

There is no scientific evidence on the effects of ashwagandha on an empty stomach. However, if you feel discomfort or experience symptoms such as nausea or vomiting, contact a medical supervisor immediately.

Can you feel ashwagandha benefits right away?

No, ashwagandha and similar adaptogens need time to work and show results. It may take up to 60 days of regular consumption to realize its beneficial effects.

Can ashwagandha cause hair loss?

No, instead, ashwagandha could potentially help alleviate stress-related hair loss by reducing the cortisol levels in the body (19). However, there is no established evidence to support the role of ashwagandha in preventing or causing hair loss.

Can ashwagandha make you feel weird?

If taken beyond the prescribed dosage, Ashwagandha may make you feel drowsy, nauseous, or uncomfortable.

Is ashwagandha good for belly fat?

Ashwagandha is believed to have a natural cortisol-lowering property, which helps reduce stress. High levels of stress often lead to the storage of abdominal fat. Hence, ashwagandha, when combined with the right lifestyle changes, may help reduce belly fat. However, limited research is available in this regard. Mary says, “While ashwagandha has been linked to weight gain in some studies, the mechanism by which it may increase belly fat specifically has not been studied in detail. If cortisol is increased in a person using this herb however they would be more prone to put on belly fat as cortisol decreases insulin sensitivity and leads to fat storage around the abdomen. If a person decreases cortisol while using the herb they would be less likely to gain belly fat.”

Does ashwagandha cause body odor?

In Sanskrit, ashwagandha literally means “odor of the horse” (as the root smells like horse’s urine). However, taking this root doesn’t make one smell bad.

Does Ashwagandha make you emotionless?

Though there is no scientific evidence to prove this, anecdotal evidence suggests that Ashwagandha may cause emotional bluntness and a feeling of disassociation.

Key Takeaways

  • Ashwagandha may cause several side effects in people with autoimmune disorders and allergies.
  • It may induce abortions, cause liver damage, lower blood sugar levels too much, and aggravate hypothyroidism.
  • In addition, people with prostate cancer, autoimmune conditions, and liver problems should avoid using this remedy.


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  1. Ashwagandha (Withania somnifera)—Current Research on the Health-Promoting Activities: A Narrative Review
  2. Ashwagandha | Memorial Sloan Kettering Cancer Center
  3. Kurapati, K. R. V., et al. “Ashwagandha.” Withania somnifera.
  4. Udayakumar, Rajangam, et al. “Hypoglycaemic and hypolipidaemic effects of Withania somnifera root and leaf extracts on alloxan-induced diabetic rats.” International journal of molecular sciences 10.5 (2009): 2367-2382.
  5. Andallu, B., and B. Radhika. “Hypoglycemic, diuretic and hypocholesterolemic effect of winter cherry (Withania somnifera, Dunal) root.” (2000).
  6. Anwer, Tarique, et al. “Effect of Withania somnifera on Insulin Sensitivity in Non‐Insulin‐Dependent Diabetes Mellitus Rats.” Basic & clinical pharmacology & toxicology 102.6 (2008): 498-503.
  7. Panda, Sunanda, and Anand Kar. “Changes in thyroid hormone concentrations after administration of ashwagandha root extract to adult male mice.” The Journal of pharmacy and pharmacology 50.9 (1998): 1065-1068.
  8. Singh, Narendra, et al. “An overview on ashwagandha: A Rasayana (Rejuvenator) of Ayurveda.” African Journal of Traditional, Complementary and Alternative Medicines 8.5S (2011).
  9. Chandrasekhar, K., Jyoti Kapoor, and Sridhar Anishetty. “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 journal of psychological medicine 34.3 (2012): 255.
  10. Kumar, A., and H. Kalonia. “Effect of Withania somnifera on sleep-wake cycle in sleep-disturbed rats: Possible GABAergic mechanism.” Indian journal of pharmaceutical sciences 70.6 (2008): 806.
  11. Kaushik, Mahesh K., et al. “Triethylene glycol, an active component of Ashwagandha (Withania somnifera) leaves, is responsible for sleep induction.” PloS one 12.2 (2017).
  12. Ilayperuma, I., W. D. Ratnasooriya, and T. R. Weerasooriya. “Effect of Withania somnifera root extract on the sexual behaviour of male rats.” Asian Journal of Andrology 4.4 (2002): 295-298.
  13. Ashwagandha and Kidney Transplant Rejection – PMC
  14. Effect of Ashwagandha (Withania somnifera) Root Powder Supplementation in Treatment of Hypertension
  15. Efficacy and Safety of Ashwagandha Root Extract in Subclinical Hypothyroid Patients: A Double-Blind Randomized Placebo-Controlled Trial
  16. A Randomized Double-Blind Placebo-Controlled Crossover Study Examining the Hormonal and Vitality Effects of Ashwagandha (Withania somnifera) in Aging Overweight Males – PMC
  17. Ayurvedic medicine and anaesthesia – PMC
  18. Choudhary, Dnyanraj, Sauvik Bhattacharyya, and Kedar Joshi. “Body weight management in adults under chronic stress through treatment with Ashwagandha root extract: a double-blind, randomized, placebo-controlled trial.” Journal of evidence-based complementary & alternative medicine 22.1 (2017): 96-106.
  19. An overview on ashwagandha: a Rasayana (rejuvenator) of Ayurveda
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