Marshmallow Root
Commonly used for
Digestive Health
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What is it? / Overview
Like slippery elm, marshmallow root contains bioadhesive mucilaginous polysaccharides that form a protective film over irritated mucosa; in vitro these polysaccharides also stimulate epithelial cell viability, supporting the traditional use for irritated membranes, though human trial evidence is essentially absent.
How is it used? / Administration
Form: Marshmallow (Althaea officinalis) root extract, powder, syrup, or lozenges
Typical dose studied: ~1-6 g/day of root or equivalent extract; no validated dose
Timing: With water; separate from medications by at least 2 hours
Traditional-use item -- the main practical caution is delayed absorption of concurrent oral drugs.
How well does it work? / Evidence
? Emerging / limited evidence
Who should avoid it?
Avoid with: Type 2 diabetes mellitus; Breastfeeding
Interacts with: Oral medications generally -- mucilage may delay absorption; separate dosing; Antidiabetic agents -- theoretical additive glucose-lowering
Already taking it? Low-risk to continue if helpful and dosed away from other medications; efficacy evidence in humans is essentially absent.
Research & references
Deters A et al. (2010). Aqueous Extracts and Polysaccharides From Marshmallow Roots: Cellular Internalisation and Stimulation of Cell Physiology of Human Epithelial Cells in Vitro. Journal of Ethnopharmacology. Thumann TA et al. (2019). The Role of Gut Microbiota for the Activity of Medicinal Plants Traditionally Used in the European Union for Gastrointestinal Disorders. Journal of Ethnopharmacology.
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