Guide
Is it safe to take ashwagandha every day?
Daily-use trials of a few weeks to a couple of months found mostly mild side effects. But documented liver-injury case reports exist at close to our own 1,300 mg/day dose, and daily use over months or years hasn't been specifically studied; ask a doctor first if you're pregnant, have a thyroid condition, or take certain medications.
For most healthy adults, trials of daily ashwagandha lasting a few weeks to a couple of months found mostly mild side effects. That's not the whole picture, though: documented case reports of liver injury exist at a dose close to our own 1,300 mg/day, and nobody has specifically studied daily use over months or years at our dose and form. Pregnancy, thyroid conditions and certain medications are reasons to ask a doctor before starting.
What the daily-use trials found
A 2012 open-label study gave 18 healthy adults an escalating dose of ashwagandha extract, up to 1,250 mg/day, for 30 days straight. All but one volunteer tolerated it without an adverse event; organ function tests stayed normal throughout. A 2018 randomized, placebo-controlled trial gave 50 adults 600 mg/day of ashwagandha extract for 8 weeks and reported only mild, temporary adverse effects in 4 of the 50 participants. A 2020 review pooling 30 human trials of ashwagandha root preparations found no serious adverse events and no meaningful changes in bloodwork across any of them — the most common effects were drowsiness, stomach discomfort and loose stools, most described as mild and temporary. That's a reassuring pattern for trials running weeks, not years.
The liver caution, stated plainly
Documented case reports complicate the "mostly mild" picture above. A 2023 paper reports a 36-year-old man who took 450 mg ashwagandha capsules three times daily — 1,350 mg/day, almost exactly our own daily dose — for six months before developing liver injury judged "probably" caused by the supplement; a second case occurred at 45 days. A 2024 case report describes a healthy 22-year-old who developed liver injury within 30 hours of starting ashwagandha capsules. These are individual, causality-scored case reports, not a measured rate across a population, and most people in the trials above didn't develop liver problems. But the first case sits closer to our exact daily amount than anything else in the research we've reviewed, and it's a real, documented risk — not a theoretical one.
Stop and see a doctor for yellowing skin or eyes, dark urine, unusual itching, unexplained fatigue, or pain under the right ribs. If you have existing liver disease, ask a doctor before using ashwagandha at all — this article's general answer doesn't cover that situation.
The thyroid caution
A 2018 randomized trial found 600 mg/day of ashwagandha extract measurably raised T3 and T4 and lowered TSH — thyroid hormones — over 8 weeks compared with placebo, in adults with subclinical hypothyroidism. That's real, demonstrated hormonal activity, not a theoretical concern. We don't make a thyroid claim in either direction; the practical takeaway is that anyone with a thyroid condition or taking thyroid medication should ask a doctor before daily use, since the interaction risk runs in a specific, documented direction.
Should you cycle ashwagandha, or take breaks?
No trial we've reviewed has tested a specific cycling schedule (on-weeks, off-weeks) for ashwagandha. Nothing in the research shows breaks are necessary, and nothing shows continuous daily use at label dose causes a problem that a break would prevent. If you'd rather cycle it, nothing here suggests that's harmful either — it's a personal choice, not one backed by trial data either way.
| Amount / duration | |
|---|---|
| Our label dose | 1,300 mg root powder + 10 mg black pepper/day |
| Longest trial with mostly mild side effects | 8 weeks (600 mg/day extract) |
| Case report of liver injury closest to our dose | 1,350 mg/day capsules, 6 months |
| Daily use over months to years | Not specifically studied at this dose and form |
Who should ask a doctor before daily use
- Pregnant or nursing. Our label says do not use if pregnant or nursing — ask your doctor rather than looking for a workaround dose.
- Thyroid condition or thyroid medication. See the thyroid caution above.
- Sedatives, sleep medication or benzodiazepines. Ashwagandha has sedative activity of its own; ask your doctor or pharmacist about added drowsiness before combining them.
- Immunosuppressant medication or an autoimmune condition. Ashwagandha shows immune-stimulating activity in laboratory research, which could theoretically work against immune-suppressing treatment — ask your doctor first.
- Upcoming surgery. Ashwagandha's sedative activity may interact with anesthesia; ask your doctor about stopping it beforehand.
- Diabetes or another metabolic condition — ask your doctor before adding any new supplement, since this article doesn't cover that situation specifically.
- Known nightshade sensitivity. Ashwagandha is a nightshade-family plant (the same family as tomato, potato and eggplant) — use caution if you have a known nightshade sensitivity.
- Under 18. Our label directs anyone under 18 to consult a physician before use; we don't give a dose for children or teens.
Questions people ask
Is it safe to take ashwagandha every day?
For most healthy adults, the daily-use trials we've reviewed — running from weeks up to 8 weeks — found mostly mild side effects. Documented liver-injury case reports exist at a dose close to ours, and daily use over months or years hasn't been specifically studied, so "yes, indefinitely" isn't something the evidence fully backs either. Ask a doctor first if you're pregnant, have a thyroid condition, or take other medication.
What happens if you take ashwagandha every day for a long time?
We don't have trial data on continuous daily use beyond a few months at this dose and form. The liver-injury case reports above occurred at 45 days and 6 months, which is a genuine reason for caution over long stretches of use, not just a formality.
What happens if you stop taking ashwagandha?
We haven't found a trial measuring what happens after stopping ashwagandha. No withdrawal effect has been documented in the research we've reviewed, but that reflects a lack of study rather than a confirmed "nothing happens" answer.
Is ashwagandha safe for dogs or cats?
This article covers people, not pets — ask a veterinarian about dosing for an animal.
Is ashwagandha safe for liver and kidneys?
See the liver caution above — case reports of injury exist at a dose close to ours, so this isn't a clean "yes." We haven't found comparable kidney-specific case reports in the research reviewed here.
Related reading: how much ashwagandha is too much?, who should not take ashwagandha, and is ashwagandha bad for your liver?.
Sources
- Herb-Induced Liver Injury by Ayurvedic Ashwagandha as Assessed for Causality by the Updated RUCAM: An Emerging Cause Two adults taking 450 mg ashwagandha capsules (one at 1,350 mg/day) developed liver injury judged 'probably' caused by the supplement, resolving after stopping it.
- Ashwagandha-Induced Hepatic Injury: A Case Report A healthy 22-year-old developed liver injury 30 hours after starting ashwagandha capsules; dose not reported.
- Efficacy and Safety of Ashwagandha Root Extract in Subclinical Hypothyroid Patients: A Double-Blind, Randomized Placebo-Controlled Trial In 50 adults with subclinical hypothyroidism, 600 mg/day of ashwagandha root extract for 8 weeks measurably shifted TSH, T3 and T4 versus placebo.
- Safety and clinical effectiveness of Withania Somnifera (Linn.) Dunal root in human ailments Across 30 human trials of ashwagandha root preparations, no serious adverse events were reported; the most common mild effects were drowsiness, stomach discomfort and loose stools.
- Exploratory study to evaluate tolerability, safety, and activity of Ashwagandha (Withania somnifera) in healthy volunteers In 18 healthy adults, an 8:1 ashwagandha extract at 750-1,250 mg/day for 4 weeks was mostly well tolerated, with one withdrawal for adverse effects; there was no placebo group to compare against.
*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.
