Marshmallow Root

Althaea officinalis

Family: Malvaceae Part used: Root, leaves, flowers

Key Compounds

• Mucilage polysaccharides
• Pectin
• Scopoletin
• Isoscopoletin
• Quercetin
• Kaempferol
• Rutin
• Chlorogenic acid
• Caffeic acid
• Asparagine
• Beta-sitosterol
• Phenolic acids

Traditional Use

• Demulcent for dry cough and sore throat — mucilage (35–40% of dry root weight) forms a protective gel on mucosal surfaces; the gel physically coats and soothes irritated tissues in the throat and respiratory tract; mechanism is primarily physical (gel coating) rather than pharmacological; cold infusion preserves mucilage better than hot tea
• Gastrointestinal protection — mucilage coats the gastric mucosa; traditional and clinical use for gastritis, peptic ulcers, acid reflux, and inflammatory bowel conditions; a 2013 Marshmallow Root study (Razavi et al.) showed significant reduction in gastric irritation in an animal model; German Commission E approved for irritation of oral and pharyngeal mucosa and dry cough
• Urinary tract soothing — traditional European use for UTI symptoms and urinary tract inflammation; the mucilage coats the urothelium as it passes through; not antibacterial — it soothes the inflamed tissue rather than treating the infection; used alongside appropriate treatment for symptomatic relief
• Original marshmallow candy — pâte de guimauve, French confection first produced in 19th century Paris; boiled root mucilage + sugar + egg white, set into soft pillows; children were given it as a soothing sweet for sore throats; gelatin replaced the root in industrial production early 20th century; commercial marshmallows now contain no Althaea officinalis
• Ancient wound and skin herb — used in ancient Egyptian medicine (documented in the Ebers Papyrus, approximately 1550 BCE); poultices for abscesses, wounds, and skin irritation across Mediterranean and Middle Eastern traditions; the genus name Althaea from Greek *althainein* (to heal)
• Paediatric soothing — traditionally given to teething infants; the root itself, not dried powder, was given to children to chew on; the mucilage release soothes inflamed gum tissue; this practice is documented across European and Middle Eastern folk medicine

The candy was originally made from this plant.

French confectioners in the 19th century made pâte de guimauve — a soft, pillow-shaped sweet — by boiling marshmallow root to extract its mucilage, then combining it with sugar and egg white. The result was sold in pharmacies for sore throats and at sweet shops for pleasure. The two uses were not entirely separate.

In the early 20th century, industrial manufacturers replaced the root extract with gelatin. This was cheaper and more consistent at scale. The name stayed. The shape stayed. The soft pillow texture stayed. The plant did not.

Commercial marshmallows today contain no marshmallow. The medical application that inspired the name continues to work.

Meet the plant

A tall perennial herb, 60–200 cm, with soft velvety grey-green leaves covered in star-shaped hairs and pale pink five-petalled flowers. It grows in salt marshes, damp meadows, and river banks. The genus name is Greek: althainein, to heal.

The plant has been in use since at least 1550 BCE — the Egyptian Ebers Papyrus records it for wound treatment. The name acknowledges the oldest documented use in the genus name itself.

The mucilage: 35 to 40 percent of the root

This is the relevant fact. Marshmallow root contains 35–40% mucilaginous polysaccharides by dry weight — one of the highest concentrations of any medicinal root. When the dried root is soaked in cold water, these polysaccharides absorb the water and form a viscous gel. Drink this gel, and it coats the tissues of the throat, oesophagus, and stomach as it passes through.

The mechanism is almost entirely physical. The gel forms a temporary protective layer over irritated mucous membranes. It reduces friction. It shields tissue from further irritation. It creates a surface on which inflamed tissue can recover. It is not anti-inflammatory in the biochemical sense — it is a physical barrier.

This is why marshmallow works for exactly the conditions it has always been used for: dry coughs, sore throats, gastritis, stomach ulcers, and urinary tract irritation. The common factor is irritated mucous membrane that needs coating.

German Commission E approved it for exactly these applications.

Why cold infusion

Hot water extracts mucilage from the root but also extracts tannins. Tannins bind the mucilage polysaccharides and reduce their gel-forming activity. The practical effect: hot-water tea has lower functional mucilage than cold infusion.

Cold infusion: soak 1–2 tablespoons of dried root in 500ml of cold water for 4–8 hours, then strain and drink. The result is slightly viscous, slightly sweet, and noticeably different in texture from ordinary herbal tea.

For coating the stomach specifically — gastritis, ulcers — the cold infusion method is most effective. For general soothing effects where exact mucilage concentration matters less, hot tea is acceptable.

The root is always more effective than the leaf for mucilage content, though the leaf has the same compound class at lower concentration.

The chemistry

Mucilage polysaccharides: The therapeutic core. D-galacturonic acid, L-rhamnose, D-galactose, and L-arabinose in a branched polymer. Concentration highest in the root. Not absorbed — acts locally.

Pectin: A gel-forming polysaccharide with additional gut-soothing properties.

Flavonoids: Quercetin, kaempferol, rutin — anti-inflammatory activity complementing the physical mucilage effect.

Scopoletin and isoscopoletin: Coumarins with mild anti-inflammatory and antispasmodic activity.

What people actually do with it

Cold infusion (primary, for maximum mucilage): 1–2 tablespoons dried root soaked in 400–500ml cold water, 4–8 hours. Strain and drink throughout the day. Slightly viscous texture. Used for gastritis, ulcers, sore throat, cough.

Hot tea (convenient alternative): 1–2 teaspoons dried root per cup, steeped 15–20 minutes. Lower mucilage than cold infusion but simpler to prepare.

Throat lozenges and cough syrups: Marshmallow extract is a common ingredient in commercial preparations for sore throat and dry cough. The mechanism is the same — mucilage coating.

Topical use: The root decoction applied as a compress to boils, abscesses, and minor wounds. Traditional use going back to Egyptian medicine.

Timing for stomach conditions: Take 30–60 minutes before meals so the mucilage coats the stomach before food arrives.

Could you grow this yourself?

In moist to damp soil: yes, and easily. Marshmallow needs reliably moist conditions — it fails in dry soil. In the right conditions it grows vigorously and spreads. The flowers are attractive and the plant looks more ornamental than it sounds.

Harvest the root in autumn of the second or third year (first-year roots are small; older roots are woody). Clean, peel, and dry slowly at low temperature.

Marshmallow root (ウスベニタチアオイ) in Japan

Marshmallow (Althaea officinalis) is grown in Japan primarily as a garden ornamental. The name ウスベニタチアオイ (pale pink standing hollyhock) describes its appearance accurately — it is in the same family as the Japanese hollyhock used in the葵祭 (Aoi Matsuri) festival in Kyoto, though a different species.

The plant is not a traditional Japanese medicinal herb and is absent from the kampo formulary. It appears in the Japanese supplement market as a Western herbal medicine import, particularly in throat and digestive formulations. Japanese consumers encounter it primarily in products imported from Germany and the UK.

The candy connection is sometimes referenced in Japanese confectionery history discussions, particularly regarding French patisserie traditions.

Things you’re probably wondering

Why is the candy called marshmallow if it has no plant in it? The original candy was made from the plant. Industrial production replaced the plant with gelatin in the early 20th century. The name, shape, and texture survived. The plant did not.

Why cold infusion rather than hot tea? Hot water extracts tannins as well as mucilage. Tannins bind and reduce the mucilage’s effectiveness. Cold water extracts primarily mucilage, producing a more potent demulcent preparation.

Can it treat a UTI? It soothes the burning sensation but does not kill bacteria. Use alongside appropriate medical treatment for symptomatic relief.

Which part has the highest mucilage? The root: 35–40%. Leaves and flowers have lower concentrations. Root is the standard medicinal part.

Botanical details

The full compound list

See Also

• Chamomile — complementary anti-inflammatory for throat and digestive conditions
• Meadowsweet — fellow gastric herb; salicylate-based mechanism rather than mucilage
• Nettle — nutritional spring green; combined with marshmallow in respiratory formulas

References

• Deters, A. et al. (2010). Aqueous extracts and polysaccharides from marshmallow roots. Journal of Ethnopharmacology, 127(1), 62–69.
• Razavi, B.M. et al. (2013). Gastroprotective activity of Althaea officinalis. Iranian Journal of Basic Medical Sciences, 16(12), 1246–1251.
• Benso, B. et al. (2019). Antimicrobial activity of Althaea officinalis extract. Archives of Oral Biology, 100, 55–58.