Slippery elm

Also known as ulmus rubra, slipery elm.

Last reviewed October 9, 2026 · Jump to references

What is Slippery elm?

In plain words

Slippery elm is a tree whose inner bark is used in herbal products. When mixed with water, substances in the bark form a thick gel that may soothe surfaces in the mouth, throat, and digestive tract. Researchers study it for throat irritation and digestive symptoms, but good human studies showing clear benefits are limited.

Technical definition

Slippery elm (Ulmus rubra) is a North American tree whose inner bark is used as a botanical preparation rich in mucilage, a mixture of water-binding polysaccharides. These compounds form a viscous gel thought to provide a local demulcent, or surface-soothing, effect rather than act through a defined molecular receptor. In the United States, slippery elm is marketed in dietary supplements, which are not FDA-approved to treat diseases.

Educational information only. This page does not provide medical advice or determine whether a supplement is appropriate for you. Review supplements with a qualified healthcare professional, especially if you take medication, are pregnant, have surgery scheduled, or have a chronic medical condition.

Evidence by use

Each use is rated on its own. There is no single overall effectiveness score.