Last verified: 17 days ago
Slippery Elm Bark
Also known as: Ulmus rubra, Ulmus fulva, red elm, Indian elm
Evidence under review. — Not yet rated
Inner tree bark used for gut soothing. Limited evidence for IBS relief; always used in blends, never alone.
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What it does
Slippery elm bark comes from the inner bark of the North American red elm tree. It contains mucilage — a gel-like substance that coats and soothes the digestive tract, which is why it has been...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose
What the Science Says
Slippery elm bark comes from the inner bark of the North American red elm tree. It contains mucilage — a gel-like substance that coats and soothes the digestive tract, which is why it has been used traditionally for gut complaints. The limited clinical research available tested it only as part of multi-ingredient formulas for IBS symptoms like bloating, straining, and abdominal pain, with some positive results — but it is impossible to know how much slippery elm itself contributed.
What It Doesn't Do
No proven detox effect — one RCT found a detox blend containing slippery elm did nothing for body composition, waist size, or gut symptoms. Won't cure psoriasis on its own. No evidence it works as a standalone treatment for any condition. The 'cleansing' and 'toxin removal' claims are marketing, not science.
Evidence-Based Benefits
Part of herbal blends that reduced bloating, straining, and abdominal pain in IBS patients.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
A slippery elm-containing formula increased bowel movement frequency in constipation-predominant IBS.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown — no pharmacokinetic data available from the provided studies. Its mucilage likely acts locally in the gut rather than being absorbed systemically.
Red Flags to Watch For
- Always studied in multi-ingredient blends — impossible to attribute any benefit to slippery elm alone
- May slow absorption of oral medications due to its mucilage coating effect — a concern especially for elderly patients on IBD drugs
- Detox and cleansing product claims are unsupported by clinical evidence
- Most available research is very low quality: uncontrolled pilots and case reports only
- Widely used in over 1,000 registered supplement products despite minimal clinical evidence
Products Containing Slippery Elm Bark
See how Slippery Elm Bark is used in these analyzed products:
Frequently Asked Questions
What does Slippery Elm Bark do?
Inner tree bark used for gut soothing. Limited evidence for IBS relief; always used in blends, never alone.
What is the effective dose of Slippery Elm Bark?
No established dose
Is Slippery Elm Bark safe?
Always studied in multi-ingredient blends — impossible to attribute any benefit to slippery elm alone
What doesn't Slippery Elm Bark do?
No proven detox effect — one RCT found a detox blend containing slippery elm did nothing for body composition, waist size, or gut symptoms.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25