Elm Bark (Slippery Elm)
Also known as: Slippery Elm, Ulmus rubra, Ulmus laevis, Red Elm, Indian Elm
Effective Dosage
No established dose
What the Science Says
Slippery elm is the inner bark of the Ulmus rubra tree, long used in traditional medicine for digestive complaints. It has been studied as part of herbal blends for irritable bowel syndrome (IBS), where formulas containing it were associated with improvements in bloating, abdominal pain, straining, and stool consistency in small pilot studies. It has also appeared in multi-ingredient detox and psoriasis dietary protocols, though its individual contribution in those contexts is impossible to separate from other ingredients.
What It Doesn't Do
Won't detox your body — a clinical trial found a blend containing slippery elm bark did nothing for body composition, waist size, or gut symptoms in healthy women. No evidence it works as a standalone treatment for IBS. Don't count on it to treat cancer — the lab study showing anti-tumor effects used a different elm species in a test tube, not in humans. No proof it cures psoriasis on its own.
Evidence-Based Benefits
Elm bark, particularly slippery elm, is traditionally used for its soothing properties on the digestive tract. Some limited studies suggest it may help alleviate symptoms of gastrointestinal discomfort, such as heartburn and inflammatory bowel conditions.
Weak EvidenceEffective at: No established dose
Source: PubMed, NIH DSLD
Absorption & Bioavailability
Unknown — no pharmacokinetic or absorption data available from the provided studies
Red Flags to Watch For
- Never tested as a standalone ingredient in clinical trials — always buried in multi-ingredient blends, making it impossible to know if it does anything on its own
- Potential drug interactions in elderly IBD patients taking immunosuppressants or other medications — consult a doctor before use
- Detox products containing slippery elm bark have been clinically shown to be ineffective — the marketing claims are not supported by evidence
- Lab-based anti-cancer findings (in a different elm species) are being misrepresented in some marketing; no human cancer data exists
- Widely used in over 1,000 registered supplement products despite very limited clinical evidence
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: 2026-04-06