Ashwagandha side effects can include drowsiness, stomachache, diarrhea, nausea, and vomiting. The bigger questions are your medicines, immune health, pregnancy plans, thyroid or hormone concerns, and whether the herb fits your own health picture.
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What is ashwagandha?
Ashwagandha is the common name for Withania somnifera, an evergreen shrub native to parts of Asia, Africa, and the Middle East. It has been used in Ayurveda, the traditional Indian medical system, for more than 3,000 years. Its root is commonly used in capsules, powders, liquids, and gummies.
In traditional use, ashwagandha has been associated with stress, sleep, stamina, and general wellbeing. “Adaptogen” is a marketing and herbal-medicine term often used for plants believed to help the body respond to stress; it is not a promise that a supplement will have the same effect for every person.
What side effects can ashwagandha cause?
Memorial Sloan Kettering Cancer Center lists mild-to-moderate drowsiness, stomachaches, and diarrhea as common side effects. Ohio State Health & Discovery also lists nausea, diarrhea, and vomiting. These are useful symptoms to keep in mind before adding any new herb to a routine.
| Possible concern | What the published sources report | What to do with that information |
|---|---|---|
| Stomach upset | Memorial Sloan Kettering lists stomachaches and diarrhea; Ohio State lists nausea, diarrhea, and vomiting. | Bring up prior stomach sensitivity when discussing the herb with a clinician. |
| Drowsiness | Memorial Sloan Kettering lists drowsiness that can come and go. | This matters if you use medicines or other products that make you sleepy. |
| Liver concerns | A 2026 adverse-effects review describes reported liver toxicity and calls for stronger long-term safety work. | Tell your clinician about any liver condition and bring the exact product label. |
| Hormone and thyroid concerns | The same review discusses endocrine effects, including reported thyrotoxicosis and adrenal suppression. | Hormone, thyroid, and adrenal questions deserve an individual medical conversation. |
| Immune concerns | Memorial Sloan Kettering says the herb may stimulate the immune system. | People with autoimmune disorders should discuss it with their healthcare team first. |
The phrase “dark side of ashwagandha” usually points to these practical issues: stomach symptoms, sleepiness, reported liver concerns, hormone-related concerns, and interactions. The useful next step is not fear; it is matching the label to your medicines and health history.
Who should avoid ashwagandha or ask first?
Pregnant or breastfeeding women should avoid ashwagandha, according to Memorial Sloan Kettering. Ohio State Health & Discovery also names people who are pregnant or trying to become pregnant, children, and people with autoimmune disorders as groups that should not take it without professional guidance.
Memorial Sloan Kettering advises stopping it one week before surgery because it can have a sedative effect and sedatives are used around surgery. Its pharmacist also advises people with an underlying condition or who take medicines to speak with their healthcare provider first.
That includes anyone weighing ashwagandha alongside prescription anxiety treatment, sleep medicines, or other medicines. Memorial Sloan Kettering notes that it may interact with medicines and has not been compared with prescription medicines for anxiety or depression.
Can you take ashwagandha with PCOS or diabetes?
PCOS and diabetes each bring hormone and metabolic questions that are personal to your health history and current medicines. Before considering ashwagandha, ask the clinician who manages your PCOS or diabetes to review the exact product, its ingredient list, and your full medicine list.
This is especially worth doing if you use more than one supplement. A label is your starting point: it tells you whether you are looking at root powder, an extract, or a blend with other ingredients. For a broader look at how human findings are interpreted, see Ashwagandha human studies.
What should you never mix with ashwagandha?
There is no short universal “never mix” list that replaces a pharmacist’s review. The clearest concern in the material here is combining a potentially sedating herb with medicines or products that can make you sleepy, and using it near surgery. Memorial Sloan Kettering specifically says it can interact with medicines you may be taking.
For magnesium plus ashwagandha, ask a pharmacist to check both labels and every medicine you use before combining them. Magnesium products themselves can interact with certain antibiotics, osteoporosis medicines, and diuretics, according to Cleveland Clinic’s magnesium guide.
Is ashwagandha hard on the liver or kidneys?
The organ most often raised in the supplied safety literature is the liver. The 2026 adverse-effects review describes reported liver toxicity, particularly with prolonged or excessive use, while Ohio State Health & Discovery says a clinician may use blood tests to monitor liver and kidney function for a person taking ashwagandha.
If you have a liver or kidney condition, this is a clinician question before you add an herb. Take the bottle or a clear photo of the Supplement Facts panel to that conversation.
Does ashwagandha affect men and women differently?
The sources here do not provide a separate side-effect rate for males and females. In a small study of overweight men with mild fatigue, Memorial Sloan Kettering reports that ashwagandha increased testosterone levels, but says that result cannot be applied to the wider population.
Women do not need to assume the same experience. Memorial Sloan Kettering says safety studies in women were still needed and advises pregnant or breastfeeding women to avoid the herb. If hormones, fertility, PCOS, or perimenopause are part of your picture, make that the center of the conversation with your clinician.
Does ashwagandha work for anxiety or sleep right away?
It is not an instant answer for a stressful day. A 2021 systematic review and meta-analysis combined five randomized trials with 400 participants and found a small improvement in overall sleep. The effect was more noticeable in studies lasting at least eight weeks and in people diagnosed with insomnia.
Ohio State Health & Discovery says people may notice feeling calmer or sleeping better over roughly four to 12 weeks, while noting that responses vary. The research gives a longer time frame than a single day, not a dependable clock for any one person. For sleep, the NHS also points to basics that do not depend on a supplement: a regular routine, a calmer wind-down, and a quiet, dark, cool room in its sleep guidance.
Is ashwagandha a drug, addictive, or likely to make you emotionless?
Ashwagandha is an herb commonly sold as a dietary supplement, not a prescription anxiety medicine. Memorial Sloan Kettering says it may cause adverse effects and interactions, which is why it should not be treated as interchangeable with prescribed care.
Ohio State Health & Discovery says feeling emotionally numb is possible for a sensitive person but is not a common side effect. If you are worried about feeling different after changing a supplement, take that concern seriously and bring the product label, timing, and symptoms to a clinician.
If your concern is stopping an herb or feeling unwell after changing it, get individualized advice rather than trying to sort it out alone. The supplied research does not give a reliable withdrawal-symptom checklist or a clear answer about dependence for every product and preparation.
Before you put ashwagandha on the shelf
- Check whether the label says root powder, root extract, or a blend.
- Write down every prescription medicine, over-the-counter medicine, and supplement you use.
- Ask about autoimmune conditions, pregnancy plans, surgery, liver or kidney concerns, thyroid or hormone concerns, PCOS, and diabetes.
- Ask a pharmacist about possible interactions, especially if anything you use causes sleepiness.
- For other wellness-treatment safety questions, see the site’s guide to IV nutrient therapy side effects and what to do after IV nutrient therapy reactions.
By MountainSageNaturalHealth.com Editorial Team
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.