Last verified: 17 days ago
Marshmallow Root
Also known as: Althaea officinalis, Althaea radix, marshmallow root extract
Evidence under review. — Not yet rated
Traditional herb used to soothe sore throats and dry mouth; evidence is limited and mostly from combo products.
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What it does
Marshmallow root is a plant-derived ingredient long used in traditional medicine for its mucilage — a gel-like substance that coats and soothes irritated tissues. The available clinical research...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose
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Found in
OLIPOP Blackberry Vanilla Prebiotic Soda, Renew Life 3-Day Cleanse, Vital Gut Renew Powder and 1 more
What the Science Says
Marshmallow root is a plant-derived ingredient long used in traditional medicine for its mucilage — a gel-like substance that coats and soothes irritated tissues. The available clinical research suggests it may help relieve dry mouth symptoms and sore throat discomfort, though it has only been tested as part of multi-ingredient formulas rather than on its own. It also appears in herbal cough syrups, where it may help ease irritating coughs alongside other herbs like ivy and thyme.
What It Doesn't Do
Not proven to work as a standalone treatment for any condition. No evidence it fights infections or replaces antibiotics. The sore throat studies used multi-herb blends — you can't credit marshmallow root alone. Not shown to be superior to other saliva substitutes for dry mouth. No evidence it treats burns, wounds, or skin conditions on its own.
Evidence-Based Benefits
Helps reduce dry mouth symptoms and improves quality of life in people with low saliva production.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
May help ease sore throat pain and speed symptom relief when added to standard care for viral tonsillitis.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
May help soothe irritating coughs from colds or bronchitis when combined with ivy and thyme.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown — no pharmacokinetic data provided in the available studies
Red Flags to Watch For
- Contamination risk: A documented case found marshmallow root herbal tea contaminated with atropine (from deadly nightshade), causing severe anticholinergic poisoning requiring ICU care — buy only from verified, tested brands.
- Heavy metal concerns: Studies have flagged marshmallow root products for chromium, lead, and cadmium impurities — check for third-party testing certificates.
- Most clinical evidence comes from multi-herb combination products, not marshmallow root alone — single-ingredient efficacy is unproven.
- Pregnant women should exercise extra caution given the contamination risk documented in at least one case report.
Products Containing Marshmallow Root
See how Marshmallow Root is used in these analyzed products:
Frequently Asked Questions
What does Marshmallow Root do?
Traditional herb used to soothe sore throats and dry mouth; evidence is limited and mostly from combo products.
What is the effective dose of Marshmallow Root?
No established dose
Is Marshmallow Root safe?
Contamination risk: A documented case found marshmallow root herbal tea contaminated with atropine (from deadly nightshade), causing severe anticholinergic poisoning requiring ICU care — buy only from verified, tested brands.
What doesn't Marshmallow Root do?
Not proven to work as a standalone treatment for any condition.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25