Research review
Slippery elm and ashwagandha: what the evidence says about taking them together
No trial has tested slippery elm and ashwagandha taken together, including in the maca-fenugreek-ashwagandha-slippery-elm blends the two sometimes appear in. Slippery elm's own human research is limited to two small multi-herb formula studies; ashwagandha carries a separate, documented but uncommon liver-injury signal that slippery elm's research doesn't touch.
No trial has tested slippery elm and ashwagandha taken together. The two show up side by side in some marketed maca-fenugreek-ashwagandha-slippery-elm blends, but that pairing itself has never been studied — what follows is what's actually known about each ingredient separately, and where their safety profiles differ.
What the evidence doesn't support
It doesn't support slippery elm and ashwagandha, combined, as tested for libido, fertility, energy or any other outcome the blends they appear in are marketed for. It doesn't support treating the two as similar or interchangeable — they're different plants studied for different things, one almost entirely untested in humans, the other with a larger but mixed research base. And it doesn't support the idea that slippery elm offsets or protects against anything documented about ashwagandha, since that combination hasn't been studied either.
What the trials found
Slippery elm's own human evidence is limited to two small studies, and neither tested it alone: a 2010 pilot study gave 31 adults with irritable bowel syndrome one of two multi-herb formulas containing slippery elm bark, and a 2020 study followed 43 adults through 16 weeks of a seven-ingredient digestive formula that also included it. Both were open-label with no placebo arm, and neither measured libido, fertility, energy or hormone levels — outcomes outside what either study looked at. Separately, a clinical liver-safety reference (LiverTox) found no evidence that slippery elm causes liver enzyme elevations or liver injury.
Ashwagandha's research is a different, larger field, and it includes a documented safety concern that slippery elm's doesn't. A 2026 review of ashwagandha's adverse effects, covering preclinical and clinical evidence, documented gastrointestinal side effects, immune hypersensitivity, liver toxicity and endocrine disruption, particularly with prolonged or high-dose use — the review describes ashwagandha's bioactive compounds being converted by liver enzymes into reactive intermediates linked to oxidative stress and liver injury. A separate published case report described a patient with a preexisting liver condition who developed acute-on-chronic liver failure associated with taking ashwagandha. Neither of those ashwagandha sources tested slippery elm, and no study has given people both together to see whether one affects the other.
Questions people ask
Can you take slippery elm and ashwagandha together?
No trial has tested the combination, and we haven't found a documented case of a specific problem from combining them. "Untested together" isn't the same as "confirmed safe together" — if you have a liver condition or take prescription medication, mention both supplements to a doctor before combining them.
Do maca, fenugreek, ashwagandha and slippery elm work together for energy or libido?
No study identified for this page tested that combination, or slippery elm alone, for energy, libido or fertility. Slippery elm's own research covers digestive-symptom formulas, not hormone or energy outcomes, so nothing supports that use for it specifically.
Does slippery elm protect against ashwagandha's liver risk?
That hasn't been tested. Slippery elm's own liver-safety reference found no evidence of harm from slippery elm itself, but no study has given the two together to see whether slippery elm has any bearing on ashwagandha's separate, documented injury signal.
When to talk to a doctor
Neither slippery elm nor ashwagandha is a treatment for a diagnosed condition, and nothing above supports combining them as a substitute for medical care. Anyone with a preexisting liver condition should talk to a doctor before starting ashwagandha, given its documented, if uncommon, association with liver injury. If you notice symptoms like unusual fatigue, yellowing skin or eyes, dark urine or abdominal pain while taking either supplement, stop and see a doctor rather than adding another one.
Related reading: slippery elm benefits: what the research does and doesn't show, who should not take slippery elm, and slippery elm side effects.
Sources
- Effects of two natural medicine formulations on irritable bowel syndrome symptoms: a pilot study A small, uncontrolled pilot study found two multi-herb formulas containing slippery elm bark improved IBS symptoms, but neither formula isolated slippery elm's own contribution.
- Herbal formula improves upper and lower gastrointestinal symptoms and gut health in Australian adults with digestive disorders A 16-week uncontrolled study of a seven-ingredient gut-health formula containing slippery elm reported large reductions in GI symptoms, but the formula's other six ingredients make it impossible to credit slippery elm alone.
- Slippery Elm A clinical liver-safety reference found no evidence that slippery elm causes liver enzyme elevations or liver injury.
- Potential Adverse Effects of Ashwagandha: A Critical Review of Preclinical and Clinical Evidence A 2026 review of ashwagandha's safety literature found documented reports of liver toxicity, along with gastrointestinal, immune and endocrine effects, particularly with prolonged or high-dose use, and called for better dosing standards and safety monitoring.
- Changing perspectives: unveiling the risks of ashwagandha-induced hepatotoxicity A published case report described a patient with a preexisting liver condition who developed acute-on-chronic liver failure associated with taking ashwagandha — a single case, not a trial, but one the authors present as part of a wider pattern of ashwagandha-associated liver injury reports.
*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.