Research review
Ashwagandha and probiotics: is there a tested combination?
No clinical trial has tested ashwagandha combined with a probiotic. Ashwagandha's own digestive side-effect data is limited, and no trial has tested whether a probiotic changes it.
No clinical trial has tested ashwagandha combined with a probiotic. The two are sometimes taken together as a general "gut and stress" wellness habit, or because someone starting ashwagandha wants a probiotic on hand in case of digestive upset, but that's a personal choice, not something a trial has evaluated.
What the evidence doesn't support
It doesn't support ashwagandha and a probiotic together as more effective than either alone for any outcome, digestive or otherwise — that combination hasn't been studied. It also doesn't support the idea that a probiotic prevents or reduces any digestive side effect from ashwagandha specifically; no trial has tested that either.
What's actually known
Ashwagandha's own safety data is limited on digestive side effects specifically. One open-label tolerability study in 18 healthy adults reported no gastrointestinal issues in the write-up beyond a single withdrawal for unrelated symptoms (appetite, libido, vertigo); a separate placebo-controlled trial reported only mild, unspecified adverse effects in 4 of 50 participants, without breaking those effects down further. Neither study measured whether a probiotic changed tolerability, because neither tested one. Probiotics are a distinct, separately studied supplement category in their own right, and nothing here evaluates any specific probiotic strain or product — this page is about the pairing with ashwagandha specifically, which remains untested.
Questions people ask
Should I take a probiotic with ashwagandha?
No trial answers that question either way. If you're taking a probiotic for its own reasons, there's no evidence it interacts with ashwagandha, but there's also no evidence it changes anything about how ashwagandha behaves.
Does ashwagandha upset your stomach?
Some trials of ashwagandha report mild, general adverse effects in a minority of participants, without always specifying which symptoms occurred. If a supplement is causing ongoing digestive discomfort, stopping it and talking to a doctor is a more reliable step than adding another supplement to offset it.
When to talk to a doctor
If you develop persistent digestive symptoms after starting any new supplement, stop and check with a doctor rather than layering on additional products to manage it. This is especially worth doing if you have an existing digestive condition or take medication.
Related reading: ashwagandha: what the research does and doesn't show, ashwagandha and medications: what to check, and who shouldn't take ashwagandha.
Sources
- 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.
- 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.
*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.