Is Ashwagandha Safe? Side Effects and Who Should Avoid It
Ashwagandha is generally well tolerated, and it is not safe for everyone. Those two statements sit together uncomfortably in a category that prefers reassurance, so let's be specific about both.
Here's what the side effects actually are, the interactions that matter, and the clear list of people who should avoid it — including one group where the answer is simply no.
The short answer
Most healthy adults tolerate ashwagandha well, with mild digestive upset and drowsiness the common complaints. It should be avoided entirely during pregnancy. It requires medical guidance for anyone with thyroid conditions, autoimmune conditions, or liver concerns, and for anyone taking sedatives, immunosuppressants or thyroid medication. Case reports of liver injury exist — uncommon, but documented.
The common, mild side effects
| What you might notice | Why | What helps |
|---|---|---|
| Nausea or stomach upset | Most often an empty stomach, or a higher dose | Take with food; reduce the dose |
| Loose stools | Dose-related digestive effect | Lower the dose or split it |
| Drowsiness | The calming effect, more noticeable in some people | Move it to the evening |
| Headache | Uncommon, usually transient | Reassess if it persists |
| Feeling emotionally flat | Occasionally reported at higher doses | Reduce the dose or stop |
Most of these are dose-related and resolve with adjustment. Taking it with food prevents the majority of the digestive complaints, as our dosage guide covers.
Pregnancy: the clear answer
Ashwagandha should be avoided during pregnancy. Not "discuss it" — avoided.
Traditional Ayurvedic texts describe it as abortifacient, and modern safety guidance consistently advises against use in pregnancy. There's no established safe dose, and the potential risk is not one worth taking for a wellness supplement.
For breastfeeding, the honest position is that safety hasn't been established, and most guidance recommends avoiding it. If you're nursing and considering it, that's a conversation with your healthcare provider — and the default answer is likely to be no.
If you're trying to conceive, raise it with your provider before starting rather than after.
Thyroid: the interaction people miss
Ashwagandha can increase thyroid hormone levels. That's a documented effect, and it matters in two directions.
If you have hypothyroidism and take levothyroxine or similar medication, ashwagandha could add to that effect and push your levels beyond target — which is why your prescribing doctor needs to know.
If you have hyperthyroidism or Graves' disease, increasing thyroid hormone is the opposite of what your treatment aims for, and ashwagandha isn't appropriate without specialist input.
This interaction is frequently omitted from product pages, and it's one of the more clinically relevant ones in the herbal supplement space. If you have any thyroid condition, treat ashwagandha as a medical decision.
Liver: uncommon but documented
There have been case reports of liver injury associated with ashwagandha supplements. These are uncommon relative to how widely the herb is used, and they're real enough to have been published in the medical literature.
What that means practically: anyone with existing liver conditions should not take ashwagandha without medical guidance, and anyone taking it should stop and seek advice if they develop symptoms suggesting liver trouble — persistent nausea, unusual fatigue, dark urine, pale stools, abdominal pain on the right side, or yellowing of the skin or eyes.
It's not a reason for healthy adults to avoid the herb. It is a reason to know the warning signs rather than assume "natural" means "no risk."
Autoimmune conditions
Ashwagandha may stimulate immune activity, which is unhelpful if your immune system is already attacking your own tissue.
This applies to conditions like rheumatoid arthritis, lupus, multiple sclerosis, and inflammatory bowel disease, and to anyone taking immunosuppressive medication including transplant recipients — where stimulating immune function works directly against the treatment.
Worth noting: this is the same property that gets marketed as "immune support," which is a good example of why the same mechanism can be a selling point for one person and a contraindication for another.
Medication interactions
- Thyroid medication — potential additive effect; requires monitoring
- Sedatives, sleep medication and benzodiazepines — additive drowsiness is plausible
- Immunosuppressants — works against the intended effect
- Blood pressure medication — ashwagandha may lower blood pressure modestly
- Diabetes medication — possible effects on blood sugar; worth monitoring
- Anaesthesia — tell your surgical team and follow their guidance on stopping beforehand
If you take any prescription medication, a two-minute conversation with your pharmacist covers all of this. It's the single most useful safety step available.
Who should avoid ashwagandha
- Anyone pregnant — avoid entirely.
- Anyone breastfeeding — safety not established; avoid unless your provider says otherwise.
- People with thyroid conditions — medical guidance required.
- People with autoimmune conditions or on immunosuppressants — medical guidance required.
- Anyone with liver disease — medical guidance required.
- People scheduled for surgery — tell your surgical team.
- Children and teenagers — not established; a paediatrician's decision.
- Anyone with a nightshade sensitivity — ashwagandha belongs to the nightshade family.
Stop and seek advice if you notice
- Yellowing of the skin or eyes, dark urine, or pale stools
- Persistent nausea, vomiting or upper-right abdominal pain
- Unusual or worsening fatigue
- Rash, hives, swelling or breathing difficulty — treat as urgent
- A flare of an existing autoimmune condition
- Symptoms that don't settle after reducing the dose
None of these is a wait-and-see situation. Stop the supplement and speak to a healthcare professional.
Are there side effects specific to men or women?
Not in the sense the searches imply. The common side effects — digestive upset, drowsiness — occur the same way regardless of sex.
What differs is situational. Pregnancy and breastfeeding are women-specific and carry the firmest guidance on this page. Thyroid conditions are diagnosed more often in women, which makes that interaction statistically more relevant. And men more often take ashwagandha at higher doses for training or testosterone reasons, which raises the likelihood of dose-related effects — covered in our testosterone guide.
Beyond those, the safety list applies equally to everyone.
What the first two weeks feel like
Knowing what's normal prevents both unnecessary worry and pushing through something that isn't.
Normal: nothing dramatic. Ashwagandha works gradually, so most people notice little in the first days. Mild digestive adjustment or slight drowsiness in the first week is common and usually settles, particularly once you're taking it with food.
Not normal: anything on the stop-and-seek-advice list above, symptoms that worsen rather than settle, or feeling persistently unwell. Those aren't an adaptation period — they're a signal.
The useful mental model is direction. Mild and improving is adjustment; significant or worsening means stop and ask.
Is it safe long term?
Most studies ran eight to twelve weeks, with some extending longer, and serious adverse effects were uncommon in those trials. Data beyond several months is limited rather than alarming.
There's no strong evidence requiring cycling off, though some practitioners suggest periodic breaks as general caution with botanicals. A reasonable approach: use it while it's earning its place, take breaks if you want to reassess, and keep your doctor informed.
Quality matters for safety
With any botanical, what's in the capsule matters as much as what's on the label. Herbal products vary in sourcing, and contamination and mislabelling are documented problems in the wider supplement market.
The markers worth checking: root extract rather than leaf or unspecified plant material, manufacturing under GMP standards, third-party verification, and a clean ingredient list you can actually assess.
My Balance Nutrisentials Organic Ashwagandha is made from organic root extract — root only — in a vegan, non-GMO capsule free from gluten, soy and artificial fillers, produced in a GMP-certified US facility. A simple single-ingredient formulation also means fewer variables if something disagrees with you.
The bottom line
For most healthy adults not taking medication, ashwagandha has a reassuring safety profile with mild, dose-related side effects. That's the accurate general picture.
It's also genuinely contraindicated in pregnancy, requires medical input for thyroid, autoimmune and liver conditions, and interacts with several common medications. Check the list before you start rather than after — and treat "natural" as a description of origin rather than a guarantee of safety.
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. This article is educational and not a substitute for medical advice — consult a healthcare provider before starting any supplement, and seek prompt medical attention for any concerning symptoms.
