The popularity of slippery elm bark has endured, no doubt, because it works so well for coating and soothing irritated or inflamed mucous membranes. This is the work of an ingredient in the inner bark called mucilage, a gummy, gel-like substance that when ingested forms a protective layer along the throat, digestive tract, and other areas. Astringent compounds in the herb called tannins help tighten and constrict the tissue.
For the same reasons, salves and ointments containing slippery elm have long been popular for coating well-cleaned minor wounds and burns to protect them from further injury.
Specifically, slippery elm may help to:
Soothe a cough, sore throat, and bronchitis. Slippery elm throat lozenges are particularly effective for easing a cough and soothing a sore throat, coating the area and reducing irritation. Warm slippery elm bark tea works for cough and sore throat too, as does a liquid extract. And for the pain of acute bronchitis, there may be no more soothing balm than several cups of slippery elm tea to lubricate and protect raw and irritated airways.
Ease gastrointestinal symptoms of conditions such as Crohn's disease. Slippery elm's soothing mucilage effect is also used for disorders of the gastrointestinal tract. It is part of the herbal combination called "Robert's Formula," which is widely prized by naturopathic physicians for such intestinal inflammations as gastritis, Crohn's disease, and ulcerative colitis. Even the discomforts of heartburn or an ulcer may respond to this old-time home remedy.