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Marshmallow Root (Althaea officinalis)
Mucilage-rich herb that forms a protective gel over irritated mucous membranes — soothes heartburn, gastritis, and gut inflammation.
What the evidence says
Most Marshmallow Root studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality randomised trials published 2005–2021 with a typical study size of 62 participants.
Based on 5 studies · 2 RCTs · 451 total participants
Confidence
LowWhat the studies found
By outcome
Marshmallow Root has an evidence score of 7.5/10 — strong evidence based on 5 indexed studies. Mucilage-rich herb that forms a protective gel over irritated mucous membranes — soothes heartburn, gastritis, and gut inflammation.
The commonly studied dose of Marshmallow Root is 1-2g dried root or 500-1000mg extract. Research points to an estimated optimal dose around 2000mg, with a minimum effective dose near 1000mg. Individual response varies — start low and adjust.
The best time to take Marshmallow Root is between meals. It can be taken on an empty stomach. Marshmallow root (Althaea officinalis) contains high-molecular-weight mucilage polysaccharides that form a protective gel layer over mucous membranes in the GI tract.
Ginger Extract
Likely helpsGingerols and shogaols reduce nausea, accelerate gastric emptying, and provide systemic anti-inflammatory benefits.
Inulin
Likely helpsPrebiotic fiber that selectively feeds Bifidobacteria and Lactobacilli, producing short-chain fatty acids for gut health and immunity.
Last reviewed May 2026 · evidence from 12 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Marshmallow Root has been used for thousands of years as a soothing herb for irritated tissues. It's rich in mucilage, a gel-like substance that coats and protects mucous membranes. This makes it useful for conditions involving irritation of the digestive tract, such as heartburn, gastritis, and inflammatory bowel conditions.
Creates protective coating on mucous membranes
Reduces local inflammation
How Marshmallow Root works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
1-2g dried root or 500-1000mg extract
Loading: Not required
Can be taken without food
| Form | Type |
|---|---|
| 🍵Cold water infusion (traditional method extracts more mucilage) | Recommended |
| 💊Capsules | Alternative |
| 💧Tincture | Alternative |
Cold water infusion overnight extracts more mucilage than hot tea. Capsules are convenient but may be less effective.
Minimum: 2 weeks
Optimal: 8 weeks
Cycling: Not required
Note: Works best on an empty stomach to allow direct contact with mucous membranes.
Based on combination studies and systematic reviews. Most evidence is from herbal combinations rather than marshmallow alone. Conservative estimates due to limited isolated marshmallow data.
Immediate relief for irritated tissues
May help with acid reflux symptoms
Generally considered safe; long traditional use
May slow medication absorption; take 2 hours apart
May affect blood sugar; monitor
Tip: Take 1-2 hours apart from other medications
Tip: Monitor blood sugar if diabetic
Marshmallow Root is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are may slow absorption of other medications, blood sugar lowering. Use caution if any of these apply to you: Known allergy or hypersensitivity to Marshmallow Root or related compounds.
Resistant Starch
Likely helpsBypasses small intestine digestion to feed colon bacteria that produce butyrate — supports blood sugar, gut integrity, and metabolic health.
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