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Marshmallow Root (Althaea officinalis)
A mucilage-rich traditional herb. The honest verdict: the human trials are small herbal-combination cough studies, not isolated marshmallow root for the gut — so the digestive and heartburn claims rest mostly on tradition and a plausible coating mechanism, not direct evidence.
What the evidence says
Marshmallow Root doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality randomised trials published 2005–2024 with a typical study size of 62 participants.
Based on 6 studies · 1 RCT · 122 total participants
Confidence
Low confidenceBy outcome
Emerging score reflects long traditional demulcent use and supportive reviews, but the human trials are small herbal-combination studies for cough rather than isolated marshmallow trials for gut soothing, with no meta-analyses.
No trials currently enrolling · 1 completed on ClinicalTrials.gov
Registered trials show research momentum for Marshmallow Root, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Marshmallow Root (Althaea officinalis) is rich in mucilage, a gel-like substance that plausibly coats irritated mucous membranes — and it has a long history of traditional use. But the evidence is thinner than the marketing suggests.
The human trials test herbal combinations for dry cough and throat irritation, not isolated marshmallow root for digestive complaints, and there are no meta-analyses or direct trials for heartburn, gastritis, or gut healing.
The demulcent mechanism is reasonable, but the digestive claims remain largely traditional rather than clinically demonstrated.
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.
Not studied in pregnancy or breastfeeding, only 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 has an evidence score of 3.5/10 — emerging evidence based on 6 indexed studies. A mucilage-rich traditional herb. The honest verdict: the human trials are small herbal-combination cough studies, not isolated marshmallow root for the gut — so the digestive and heartburn claims rest mostly on tradition and a plausible coating mechanism, not direct evidence. Representative study: PMID 31770755.
The commonly studied dose of Marshmallow Root is 1-2g dried root or 500-1000mg extract (a typical label dose, no cited trial of this supplement alone states a dose). Individual needs vary — start at the lower end of the range and adjust based on how you respond.
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.
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.
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Artichoke Extract
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Ginger Extract
Likely helpsGingerols and shogaols reduce nausea, accelerate gastric emptying, and provide systemic anti-inflammatory benefits.
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Likely helpsPrebiotic fiber that selectively feeds Bifidobacteria and Lactobacilli, producing short-chain fatty acids for gut health and immunity.
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Reviewed by Dr. Baher Al Hakim · Last reviewed May 2026 · evidence from 6 studies · how we score · editorial policy
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.
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