Herbal Monograph
Marshmallow
Althaea officinalis L.
Malvaceae
Premier demulcent herb — soothes and protects irritated mucous membranes of g...
Overview
Plant Description
Althaea officinalis is a herbaceous perennial growing 60–120 cm (occasionally to 200 cm) tall from a thick, fleshy, whitish taproot. The stem is erect, round, and densely covered with soft, velvety, stellate (star-shaped) hairs, giving the entire plant a grey-green, downy appearance. Leaves are alternate, ovate to cordate, 5–15 cm long, shallowly 3–5-lobed with irregularly crenate-serrate margins, thick and soft-textured, densely tomentose on both surfaces. Flowers are 2.5–5 cm in diameter, borne in axillary clusters of 2–5, with five white to pale pink petals, a prominent columnar staminal tube typical of Malvaceae, and a calyx subtended by an epicalyx of 6–9 linear bracteoles. Flowering occurs July–September. Fruit is a schizocarp breaking into 15–25 single-seeded mericarps. The root is the primary medicinal part: a thick, fibrous, whitish taproot that exudes copious mucilage when cut or chewed.
Habitat
Native to damp habitats including salt marshes, riverbanks, lake margins, brackish meadows, and coastal wetlands. Grows in moist, heavy, saline or alkaline soils. Tolerates periodic flooding and brackish conditions. Found at elevations from sea level to approximately 400 m. Prefers full sun but tolerates partial shade. Soil pH preference: slightly alkaline (7.0–8.5).
Distribution
Native to Europe (from southern Britain and Scandinavia through central and southern Europe), western and central Asia (Turkey, the Caucasus, Iran, Kazakhstan), and North Africa. Widely naturalized in eastern North America, having been introduced by early European colonists. Major commercial cultivation occurs in Germany, Hungary, Croatia, Belgium, France, and the Czech Republic.
Parts Used
Root (Althaeae radix)
Preferred: Cold-water maceration (Kaltauszug) or decoction of dried root; also used as powdered root, syrup, or tincture
The root is the primary officinal part and the subject of the Commission E positive monograph. It contains the highest concentration of mucilage polysaccharides (5–25% dry weight). Both the European Pharmacopoeia and the BHP specify the peeled, dried root. The Commission E monograph specifies a minimum mucilage content (swelling index) for quality control. The root is the preferred part for gastrointestinal and urinary tract indications.
Leaf (Althaeae folium)
Preferred: Infusion or cold maceration of dried leaf
The leaf has a separate Commission E positive monograph. Contains lower mucilage (5–10%) than the root but also provides flavonoids contributing anti-inflammatory and mild antioxidant activity. The EMA recognizes traditional use of the leaf for irritation of the oropharyngeal mucosa and associated dry cough.
Flower (Althaeae flos)
Preferred: Infusion
Used in some European traditions, particularly in France. Contains mucilage and anthocyanins. Less commonly specified in pharmacopeial monographs. Used for similar demulcent indications, particularly sore throat and cough.
Key Constituents
Mucilage polysaccharides
The mucilage polysaccharides are the primary active constituents responsible for marshmallow's demulcent, emollient, and mucoprotective actions. When hydrated, they form a viscous, gel-like layer that physically coats and protects inflamed or irritated mucous membranes. The arabinogalactan fraction's immunomodulatory activity may contribute to anti-inflammatory effects beyond simple physical protection.
Flavonoids
Flavonoids contribute anti-inflammatory and antioxidant activity that complements the physical demulcent action of the mucilage. The leaf contains higher flavonoid concentrations than the root.
Phenolic acids
Phenolic acids contribute modestly to the overall antioxidant and anti-inflammatory profile. Not primary active constituents.
Pectins
Pectins contribute to the viscous, gel-forming properties and act as a prebiotic substrate supporting beneficial gut microbiota.
Other compounds
Minor constituents contributing to overall phytochemical complexity but not primary therapeutic agents.
Herbal Actions
Soothes and protects irritated mucous membranes
The quintessential demulcent herb in Western herbal medicine. The mucilage polysaccharides form a viscous, bioadhesive gel layer that coats, soothes, and protects irritated or inflamed mucous membranes throughout the oropharynx, esophagus, stomach, intestines, and urinary tract. Commission E approved for irritation of the oral and pharyngeal mucosa and associated dry cough (leaf), and for mild inflammation of the gastric mucosa (root).
[1, 2, 9, 13]Reduces inflammation
Anti-inflammatory activity involves both physical (mucosal coating reducing irritant contact) and pharmacological mechanisms. The arabinogalactan fraction stimulates phagocytosis and complement activation. Flavonoids inhibit pro-inflammatory mediators. Decoction inhibited endothelin-1-induced tracheal smooth muscle contraction in vitro.
[7, 8, 13]Promotes the discharge of mucus from the respiratory tract
Acts as a soothing (demulcent) expectorant — soothes irritated bronchial mucosa, reduces cough reflex sensitivity, and facilitates expectoration of dry, non-productive coughs. Commission E approved the leaf for irritation of the oral and pharyngeal mucosa with associated dry cough.
[1, 9, 14]The arabinogalactan and rhamnogalacturonan polysaccharide fractions demonstrate immunostimulatory activity in vitro, including enhancement of phagocytic activity of macrophages. Clinical significance at standard oral doses not fully established.
[13]Therapeutic Indications
Digestive System
Mild gastric inflammation (gastritis, mild gastric ulceration)
Commission E approved marshmallow root for 'mild inflammation of the gastric mucosa.' The mucilage physically coats the gastric lining, reducing acid contact with inflamed epithelium. WHO monograph supports this use. A key herb in formulas for GERD, peptic ulcer disease, and non-ulcer dyspepsia.
[1, 2, 9]Respiratory System
Dry, irritative cough
Commission E approved the leaf for dry cough associated with oropharyngeal irritation. WHO supports use of the root as a demulcent for dry cough. Fink et al. (2018) survey of 822 patients found marshmallow root extract syrup effectively relieved dry cough with good tolerability.
[1, 2, 5]Urinary System
Skin / Integumentary
Atopic dermatitis (eczema)
Naseri et al. (2021) RCT in 60 children found topical Althaea officinalis cream (2%) significantly reduced SCORAD scores compared to emollient base alone (p<0.001). Pruritus and sleep disturbance also improved.
[6]Energetics
Temperature
cool
Moisture
moist
Taste
Tissue States
hot/excitation, dry/atrophy
Marshmallow is the archetypal cool, moist remedy in Western energetic herbalism. It directly addresses hot, dry, irritated tissue states — inflamed mucous membranes that are red, raw, and deficient in their natural protective mucus. Hoffmann classifies it as cooling and moistening, ideal for conditions of 'dryness and heat in the tissues.' The sweet, bland taste reflects the dominant mucilage content. Premier herb for restoring moisture to depleted tissues and quenching inflammatory heat in the mucous membranes.
Traditional Uses
European Herbalism (Eclectic and Physiomedical)
- Demulcent for inflamed and irritated GI tract mucous membranes (gastritis, enteritis, peptic ulcer)
- Soothing expectorant for dry, hacking cough and bronchial irritation
- Urinary demulcent for cystitis, urethritis, and urinary gravel
- Poultice for boils, abscesses, mastitis, and inflamed wounds
- Gargle for sore throat and oral inflammation
"Hoffmann (2003): 'Marshmallow is mucilaginous, and when mixed with water it makes an excellent soothing preparation for inflamed and irritated tissues. This makes it ideal for conditions of the digestive system, the urinary system and the respiratory system.' King's American Dispensatory (1898): 'A bland and soothing demulcent...valuable in irritation and inflammation of mucous surfaces.'"
Ancient Greek and Roman Medicine
- Wound healing and treatment of abscesses and boils (poultice)
- Sore throat and cough (root decoction with honey or wine)
- Intestinal inflammation and dysentery
- Urinary complaints and kidney stones
"The genus name Althaea derives from the Greek 'althainein' meaning 'to heal.' Dioscorides (De Materia Medica, c. 65 CE) recommended marshmallow root decoction for wounds, inflammations, and sore throats. Pliny the Elder wrote that 'whoever shall take a spoonful of the mallows shall that day be free from all diseases that may come to him.'"
[11]
Traditional Arabic/Unani Medicine
- Demulcent and emollient for respiratory catarrh and cough
- Treatment of renal and bladder stones
- Poultice for inflammatory swellings and joint pain
- Emollient laxative for constipation in dry constitutions
"In Unani medicine, marshmallow is classified as moist and cold in the second degree. Ibn Sina (Avicenna) in the Canon of Medicine described marshmallow root as a major remedy for kidney stones and urinary inflammation, and externally for inflammatory swellings."
[12]
Modern Research
Dry cough relief
Two open-label survey studies evaluated marshmallow root extract syrup for irritative dry cough in outpatient settings.
Findings: Fink et al. (2018) conducted two prospective surveys involving 822 patients with dry cough due to upper respiratory tract irritation, treated with marshmallow root extract syrup for 7–14 days. Tolerability was rated 'very good' or 'good' by 96.4%. Physician-rated efficacy was 'very good' or 'good' in 86.5% of cases. Cough severity decreased significantly by day 7.
Limitations: Open-label design without placebo control. Subject to observer bias. However, large sample size and consistent results support traditional use.
[5]
Topical treatment of atopic dermatitis
A randomized, double-blind, placebo-controlled trial evaluated topical marshmallow cream for atopic dermatitis in children.
Findings: Naseri et al. (2021) randomized 60 children aged 2–12 years with mild-to-moderate atopic dermatitis to topical marshmallow cream (2%) or emollient base, applied twice daily for 20 days. The marshmallow group showed significantly greater reduction in SCORAD index (p<0.001). Pruritus and sleep disturbance improved significantly. No adverse effects reported.
Limitations: Small sample size (n=60). Short duration (20 days). Single-center study.
[6]
Anti-inflammatory mechanisms — tracheal smooth muscle
In vitro study examined marshmallow root decoction's effect on endothelin-1-induced tracheal smooth muscle contraction.
Findings: Scheffer et al. (2002) demonstrated that aqueous extract of A. officinalis root inhibited endothelin-1-induced contraction of isolated guinea pig tracheal smooth muscle in a concentration-dependent manner, providing a pharmacological basis for the traditional use in bronchial complaints beyond simple mucosal coating.
Limitations: In vitro study. Concentrations may not reflect physiologically achievable levels. Clinical translation not established.
[7]
Mucilage polysaccharide characterization and bioadhesion
Pharmacognostic studies have characterized the structure and bioadhesive properties of marshmallow root mucilage.
Findings: Marshmallow root mucilage consists of acidic (galacturonorhamnans) and neutral (arabinogalactans) polysaccharides with molecular weights from 20–2,000 kDa. The acidic fraction demonstrates strong bioadhesive properties. In vitro, mucilage reduces the cytotoxic effects of ethanol and NSAIDs on gastric epithelial cells. The arabinogalactan fraction enhances phagocytic activity of macrophages and granulocytes.
Limitations: Structural characterization studies are primarily observational. Immunomodulatory activity requires clinical validation.
Preparations & Dosage
cold-maceration
Strength: 1:20 to 1:40 (root to water)
COLD-WATER MACERATION (Kaltauszug): Place 2–5 g (1–2 teaspoons) of dried, cut marshmallow root in a cup of cold or room-temperature water (approximately 200 mL). Macerate for 1–2 hours (overnight yields maximum mucilage), stirring occasionally. Strain through cheesecloth. Do NOT use hot water — heat denatures the mucilage polysaccharides. The cold macerate can be gently warmed before consumption but should not be boiled.
2–5 g of dried root per dose; up to 15 g daily
3–4 times daily between meals for GI indications; as needed for cough/sore throat
May be used continuously for 4–8 weeks. Reassess if symptoms persist.
1–3 g daily for children 3–12 years (Commission E)
Cold maceration is the preferred method because mucilage polysaccharides are best extracted in cold water. Prepare fresh daily or refrigerate, as the carbohydrate-rich preparation supports microbial growth.
Decoction
Strength: 1:50 (root to water)
Place 2–5 g of dried marshmallow root in 250 mL cold water. Bring slowly to a gentle simmer (do NOT boil vigorously). Simmer for 10–15 minutes. Remove from heat, cover, steep 10 minutes. Strain.
2–5 g root per cup, 3 times daily
3 times daily
As needed, up to 8 weeks
Half adult dose for children 6–12
Less viscous than cold maceration but extracts a broader range of constituents. Some practitioners combine cold maceration and decoction methods.
Tincture
Strength: 1:5 in 25% ethanol
Tincture of marshmallow root in low-alcohol menstruum. Note: mucilage is water-soluble and poorly extracted by high-proof alcohol; marshmallow tinctures use low ethanol concentration (25–40%).
2–5 mL of 1:5 tincture (25% ethanol) three times daily
Three times daily
4–8 weeks
Not the preferred form for children due to alcohol content
Less optimal preparation for marshmallow than cold maceration because alcohol precipitates mucilage polysaccharides. For maximum demulcent action, cold maceration is preferred.
Syrup
Strength: Variable; commercial preparations standardized to mucilage content
Prepare a concentrated cold maceration (1:5) overnight. Strain. Add an equal volume of honey or sugar syrup (2:1 sugar to water). Mix thoroughly. Refrigerate for up to 2–4 weeks.
10–15 mL (2–3 teaspoons) 3–4 times daily
3–4 times daily for cough and sore throat
As needed for acute conditions (1–3 weeks)
5–10 mL 3 times daily for children over 3 years
Traditional preparation for cough and sore throat. The word 'marshmallow' in confectionery derives from the original use of marshmallow root mucilage as a thickening agent — modern marshmallow candy no longer contains the plant.
Poultice
Strength: Thick paste consistency
Mix powdered marshmallow root with warm water to form a thick paste. Apply directly to affected area. Cover with clean cloth or gauze. Replace every 2–4 hours.
Sufficient powdered root to cover affected area; apply 2–3 times daily
2–3 times daily
Until inflammation resolves (typically 3–7 days)
Same as adult, adjusted to area
Traditional external application for boils, abscesses, minor burns, insect bites, and localized skin inflammation.
Safety & Interactions
Class 1
Can be safely consumed when used appropriately (AHPA Botanical Safety Handbook)
Contraindications
Allergic reactions are extremely rare but theoretically possible.
Drug Interactions
| Drug / Class | Severity | Mechanism |
|---|---|---|
| All oral medications (general class effect) (Any orally administered drug) | minor | The viscous mucilage may physically coat the GI mucosa and delay or reduce absorption of co-administered oral drugs. This is a non-specific physical interaction. |
| Oral hypoglycemic agents (Antidiabetic medications) | theoretical | Mucilage may delay gastric emptying and glucose absorption, potentially altering the pharmacokinetic profile of co-administered oral hypoglycemics. |
Pregnancy & Lactation
Pregnancy
likely safe
Lactation
likely safe
AHPA Class 1: 'Herbs that can be safely consumed when used appropriately.' No restriction on pregnancy or lactation use. Long history of safe use during pregnancy in traditional European and Arabic herbal medicine. No mutagenicity, teratogenicity, or reproductive toxicity reported. Commission E does not list pregnancy or lactation as a contraindication.
Adverse Effects
References
Monograph Sources
- [1] Blumenthal, M., Busse, W.R., Goldberg, A., et al.. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines — Althaeae radix and Althaeae folium. American Botanical Council / Integrative Medicine Communications (1998) . ISBN: 978-0-9655555-0-0
- [2] World Health Organization. WHO Monographs on Selected Medicinal Plants, Volume 2: Radix Althaeae. World Health Organization, Geneva (2002) . ISBN: 978-92-4-154537-8
- [3] European Medicines Agency, Committee on Herbal Medicinal Products (HMPC). European Union herbal monograph on Althaea officinalis L., radix. EMA/HMPC/98718/2015 (2016)
- [4] Gardner, Z., McGuffin, M. (eds.). American Herbal Products Association's Botanical Safety Handbook, 2nd Edition. CRC Press (2013) . ISBN: 978-1-4665-1695-3
Clinical Studies
- [5] Fink, C., Schmidt, M., Kraft, K.. Marshmallow Root Extract for the Treatment of Irritative Cough: Two Surveys on Users' View on Effectiveness and Tolerability. Complementary Medicine Research (2018) ; 25(5) : 299–305 . DOI: 10.1159/000489560 . PMID: 30064132
- [6] Naseri, V., Chavoshzadeh, Z., Mizani, A., et al.. Effect of topical marshmallow (Althaea officinalis) on atopic dermatitis in children: A pilot double-blind active-controlled clinical trial. Phytotherapy Research (2021) ; 35(3) : 1389–1398 . DOI: 10.1002/ptr.6899 . PMID: 33034099
- [7] Scheffer, J.J.C., et al.. Inhibitory mechanism of an extract of Althaea officinalis L. on endothelin-1-induced contraction of guinea pig trachea. Journal of Natural Medicines (2002) . PMID: 11853172
- [8] Benbassat, N., Kostova, B., Nikolova, I., Rachev, D.. Development and evaluation of novel tablets from Althaea officinalis L. root polysaccharide fraction. Turkish Journal of Pharmaceutical Sciences (2013) ; 10(1) : 91–100
Traditional Texts
- [9] Hoffmann, D.. Medical Herbalism: The Science and Practice of Herbal Medicine. Healing Arts Press (2003) . ISBN: 978-0-89281-749-8
- [10] Felter, H.W., Lloyd, J.U.. King's American Dispensatory, 18th Edition. Ohio Valley Company (1898)
- [11] Dioscorides, Pedanius. De Materia Medica. c. 65 CE (various modern translations) (65)
- [12] Ibn Sina (Avicenna). Al-Qanun fi al-Tibb (The Canon of Medicine). c. 1025 CE (1025)
Pharmacopeias & Reviews
- [13] Mills, S., Bone, K.. Principles and Practice of Phytotherapy: Modern Herbal Medicine, 2nd Edition. Churchill Livingstone / Elsevier (2013) . ISBN: 978-0-443-06992-5
- [14] British Herbal Medicine Association. British Herbal Pharmacopoeia. BHMA (1996) . ISBN: 978-0-903032-09-5
Last updated: 2026-03-02 | Status: review
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