Marshmallow Root
Also known as: Althaea officinalis, Althaea root, White mallow, Mortification root
Effective Dosage
No established dose from provided studies
What the Science Says
Marshmallow root is a plant-derived ingredient traditionally used to soothe irritated mucous membranes in the throat and mouth. The available clinical studies tested it as part of multi-herb blends for sore throat relief in children and as a saliva substitute for dry mouth — both showing modest benefits, though marshmallow root's individual contribution is unclear. It has also appeared in herbal cough syrups alongside ivy, thyme, and aniseed, where the combination was rated as effective by most patients and doctors.
What It Doesn't Do
Won't cure infections — it only helps manage symptoms. No evidence it works as a standalone treatment for any condition. Not proven to boost immunity. No data showing it treats burns, heals wounds, or detoxifies the body. The studies don't isolate marshmallow root's effects from other herbs in the formulas tested.
Evidence-Based Benefits
Demulcent herb. Forms soothing coating. Traditional use for sore throat and digestive comfort.
Weak EvidenceEffective at: 2-5g daily as tea or 500mg extract
Source: Traditional use
Absorption & Bioavailability
Unknown — no pharmacokinetic data provided in the available studies. It is typically consumed as a mucilage (gel-like extract) that coats mucous membranes locally rather than being absorbed systemically.
Red Flags to Watch For
- Contamination risk: A documented case report found marshmallow root herbal tea contaminated with atropine (from deadly nightshade), causing severe anticholinergic poisoning requiring ICU care — buy only from verified, tested manufacturers.
- Heavy metal concerns: Studies have flagged marshmallow root cough syrups for chromium, lead, and cadmium impurities — check for third-party testing certificates.
- Most clinical evidence involves multi-ingredient products, so you cannot attribute benefits to marshmallow root alone.
- Pregnant women should exercise extra caution — the contamination case involved a pregnant woman who required ICU hospitalization.
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: 2026-04-06