Plant MedicineSlippery elm

Slippery elm

Ulmus rubra

Family: Ulmaceae

Also known as: Red elm, Gray elm, Soft elm, Indian elm, Moose elm

At a glance

Best for: Sore throat, Digestive inflammation, IBS, GERD, Ulcers
Parts used: Inner bark
Common forms: Powder, Capsule, Lozenges, Tea
Evidence level: Traditional-only/Early
Cautions: Sustainability concern—overharvested in wild; May slow absorption of oral medications
Digestive
Respiratory
Powder
Capsule
Lozenges
Tea
North America
Eastern USA

What it is

Slippery elm bark contains large amounts of mucilage—a complex of polysaccharides that forms a thick, slippery gel when mixed with water. This gel coats and soothes irritated mucous membranes throughout the digestive and respiratory tract.

Traditional use

Used extensively by Native American peoples including the Cherokee, Iroquois, and Mohegan for sore throats, stomach problems, wounds, and as a survival food during lean times. The mucilaginous inner bark was eaten as porridge. Introduced to European settlers who used it widely.

What modern research suggests (Traditional-only/Early)

Limited clinical trials due to difficulty patenting and funding research on tree bark. Mechanism (mucosal coating) is well-understood and supports traditional use. A small study showed benefit for IBS symptoms. Approved by FDA as a safe and effective throat demulcent. Included in some Crohn's disease studies with positive results.

How people use it

As a throat remedy: suck lozenges as needed. As a powder: mix 1 tablespoon of powder with water or juice into a gruel consistency, 2–3 times daily between meals. As a tea: mix 1 teaspoon in warm water, stir well. Take separately from medications (at least 2 hours) as mucilage may slow absorption.

Safety + interactions

Extremely safe with no known toxicity. The main concern is that the mucilage may slow the absorption of all oral medications—take separately by at least 2 hours. Sustainability is a significant ethical concern—wild slippery elm is overharvested in its native range.

May interact with: All oral medications (separate by 2 hours)

Quality notes

Sustainability is a significant concern—wild slippery elm is overharvested. Choose products from sustainably farmed sources or consider marshmallow root (Althaea officinalis) as a more sustainable alternative with similar demulcent properties. Inner bark powder should be beige/tan, not too brown, with a distinctive sweet-earthy smell.

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Disclaimer: This content is educational and not medical advice. Always consult a qualified healthcare provider before using any herbs or supplements, especially if you are pregnant, nursing, taking medications, or have a medical condition.

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