Slippery elm is a demulcent (mucilage-containing herb) that works similarly to marshmallow root — it forms a protective gel coating over irritated GI mucous membranes. The inner bark contains 30-40% mucilage by weight. Our research shows it has FDA GRAS status and a 200-year history in American herbalism for sore throats, GERD, IBS, and IBD. Clinical evidence is surprisingly thin for such a widely used herb — only ONE small published clinical study (IBS bowel improvement). The mechanism is primarily physical (gel coating) rather than pharmacological.
Same mechanism as marshmallow root: inner bark mucilage (hexose sugars polymerized into a branched polysaccharide gel) absorbs water and forms a bioadhesive gel that: (1) physically coats inflamed mucous membranes (esophageal, gastric, intestinal); (2) protects tissue from acid, enzymes, and mechanical irritation; (3) stimulates nerve endings in the GI tract → reflex increase in mucin secretion → enhanced endogenous mucosal protection; (4) mild prebiotic — polysaccharides fermented by colonic bacteria to SCFAs. The coating is MECHANICAL, not pharmacological.
Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.