Herb Root (根 gēn)

Yao Shu Kui

Marshmallow root · 药蜀葵

Althaea officinalis L. · Radix Althaeae Officinalis

Yao Shu Kui (Marshmallow root) plant

Images shown are for educational purposes only

Marshmallow root is a cooling, moistening herb best known for soothing irritated and inflamed mucous membranes throughout the body, from the throat and lungs to the stomach and urinary tract. Its rich mucilage content creates a protective coating that helps calm dry coughs, sore throats, digestive irritation, and urinary discomfort. It is a gentle herb with a long history of use in both European and Asian herbal traditions.

Category Herbs that clear Heat and cool the Blood (清热凉血药) Herbs that clear Heat and dry Dampness (清热燥湿药)
Therapeutic focus Respiratory Health Digestive Health Urinary Health Skin Health

TCM Properties

Temperature

Cold

Taste

Sweet (甘 gān), Salty (咸 xián)

Channels entered

Lungs, Stomach, Urinary Bladder, Large Intestine

Parts used

Root (根 gēn)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Herb Does

Every herb has a specific set of actions — here's what Yao Shu Kui does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Yao Shu Kui is primarily used to support these areas of health:

Respiratory Health Digestive Health Urinary Health Skin Health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Yao Shu Kui performs to restore balance in the body:

Clears Heat and Cools the Blood Moistens dryness and protects mucous membranes Promotes Urination and Relieves Stranguria Clears Heat and Resolves Toxicity Moistens the Lungs and Stops Cough Generates Fluids

How these actions work

'Clears Heat and cools the Blood' means this herb helps reduce internal Heat conditions, particularly those affecting the Blood level. Its cold nature and sweet-salty taste work together to cool inflammatory conditions, making it useful for conditions where Heat drives bleeding or irritation of mucous membranes throughout the body.

'Moistens dryness and protects mucous membranes' refers to the herb's high mucilage content, which forms a soothing, protective layer over irritated tissues. This is why it is traditionally used for dry cough from throat irritation, stomach ulcers, and inflamed intestinal linings. The mucilage coats and shields damaged tissue, allowing natural healing to occur.

'Promotes urination and relieves painful urination' means the herb helps move fluids through the urinary system and reduces burning or painful sensations during urination. Its cold nature clears Heat from the Bladder, making it particularly suited for urinary tract infections with burning and urgency.

'Moistens the Lungs and stops cough' describes the herb's ability to soothe dry, irritated respiratory passages. Rather than suppressing the cough reflex, it addresses the underlying dryness and irritation that triggers coughing, especially the dry, hacking cough associated with throat irritation.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Yao Shu Kui is used to help correct these specific patterns.

Why Yao Shu Kui addresses this pattern

Marshmallow root's cold nature and sweet, moistening taste directly address the dryness and Heat that characterize Lung Yin Deficiency. Its high mucilage content nourishes and coats the dry, irritated respiratory lining, while its cooling property clears the mild deficiency Heat that drives a persistent, unproductive cough. By entering the Lung channel and generating fluids, it replenishes the moisture that Yin-deficient Lungs lack.

A practitioner would look for one or more of these signs

Dry Cough

Dry, tickling cough worsened by talking or dry air

Sore Throat

Dry, scratchy throat with little or no phlegm

Dry Mouth

Persistent dryness in mouth and throat

Commonly Used For

These are conditions where Yao Shu Kui is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Lung Yin Deficiency

TCM Interpretation

In TCM, a persistent dry cough usually points to insufficient Yin fluids in the Lungs. The Lungs prefer a moist environment to function properly. When Yin is depleted (from chronic illness, dry climate, or excessive Heat), the Lung tissue dries out and becomes irritated, triggering a reflexive cough that produces little or no phlegm. This is sometimes worsened by mild deficiency Heat that further evaporates Lung fluids.

Why Yao Shu Kui Helps

Marshmallow root's rich mucilage content directly addresses the core problem: dryness. Its cold, sweet, moistening nature generates protective fluids that coat and soothe the irritated respiratory lining. Research has shown that marshmallow root extract forms a protective bio-adhesive film over inflamed mucosal surfaces, which reduces irritation and supports faster tissue regeneration. Its cooling property also helps settle the mild Heat that perpetuates the drying cycle in the Lungs.

Also commonly used for

Sore Throat

Sore, dry throat with inflammation

Gastric Ulcer

Protective effect on gastric mucosa

Eczema

Topical application for inflamed, irritated skin

Constipation

Dryness-type constipation due to insufficient intestinal fluids

Bronchitis

Dry bronchial irritation with unproductive cough

Herb Properties

Every herb has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Cold

Taste

Sweet (甘 gān), Salty (咸 xián)

Channels Entered

Lungs Stomach Urinary Bladder Large Intestine

Parts Used

Root (根 gēn)

Dosage & Preparation

These are general dosage guidelines for Yao Shu Kui — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

6-15g (decoction of the dried root)

Maximum dosage

Up to 30g in decoction for acute conditions, under practitioner supervision. The related Shu Kui root classical dosage goes up to 60g (1-2 liang) in some historical formulas.

Dosage notes

Use lower doses (6-9g) for mild throat or cough complaints where its demulcent, mucilage-rich properties provide a soothing coating. Higher doses (9-15g) are appropriate for clearing Heat, cooling Blood, and treating urinary or gynaecological conditions. For external application (poultices for sores, boils, burns), fresh root can be mashed and applied directly in appropriate amounts. When used as a powder for internal administration, the dose is considerably smaller (1-3g). A cold-water infusion (soaking the root in room-temperature water overnight) is traditionally considered the best method to preserve the mucilage content.

Preparation

For decoctions intended to maximize mucilage extraction, a cold-water infusion (soaking crushed dried root in room-temperature water for several hours or overnight, then gently warming) is preferred over prolonged boiling, as excessive heat can degrade the mucilage polysaccharides. If decocting in a standard formula, add near the end of cooking (后下, hòu xià) and decoct for no more than 10-15 minutes to preserve the demulcent properties.

Common Herb Pairs

These ingredients are traditionally combined with Yao Shu Kui for enhanced therapeutic effect

Gan Cao
Gan Cao 1:1

Gan Cao (Licorice) and marshmallow root together create a powerful demulcent and anti-inflammatory pair for the digestive and respiratory tracts. Gan Cao harmonizes and detoxifies while also soothing the throat, and marshmallow root adds its rich mucilage to coat and protect irritated tissues. Together they provide both deep moistening and gentle anti-inflammatory action.

When to use: For dry, irritative cough with sore throat, or for gastric irritation and mild ulcer symptoms where both soothing and harmonizing effects are needed.

Che Qian Zi
Che Qian Zi 1:1

Che Qian Zi (Plantago seed) clears Heat and promotes urination, while marshmallow root adds its soothing, mucosal-protective effect to the urinary tract. Together they both drain Damp-Heat from the Bladder and protect the inflamed urinary lining from further irritation.

When to use: For urinary tract infections with burning, urgent, painful urination, or urinary stones with irritation.

Tian Men Dong
Tian Men Dong 1:1

Mai Men Dong (Ophiopogon) and marshmallow root both moisten and generate fluids but through complementary mechanisms. Mai Men Dong nourishes Lung and Stomach Yin at a deeper level, while marshmallow root provides immediate surface-level mucosal protection. The pair addresses both the root (Yin deficiency) and the branch (mucosal dryness and irritation).

When to use: For chronic dry cough with Lung Yin deficiency, or dry throat and mouth from prolonged illness or a dry environment.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Tian Men Dong
Yao Shu Kui vs Tian Men Dong

Both moisten the Lungs and generate fluids, but Mai Men Dong (Ophiopogon) works more deeply to nourish Lung and Heart Yin and enters the Heart channel, making it better for Yin deficiency with palpitations and restlessness. Marshmallow root works more on the surface, physically coating and protecting irritated mucous membranes with its mucilage, making it superior for immediate soothing of dry, irritated throat and respiratory passages.

Lu Gen
Yao Shu Kui vs Lu Gen

Both are cold and sweet and generate fluids, but Lu Gen (Phragmites root) more strongly clears Lung and Stomach Heat and promotes urination, with a particular indication for vomiting from Stomach Heat. Marshmallow root has superior demulcent and mucosal-protective actions due to its rich mucilage, making it more appropriate when physical tissue irritation and dryness are the primary concern rather than outright Heat.

Identity & Adulterants

Related species and common adulterations to be aware of when sourcing Yao Shu Kui

Yao Shu Kui (药蜀葵, Althaea officinalis) is sometimes confused with Shu Kui (蜀葵, Althaea rosea, common hollyhock), which is a much taller biennial (up to 2.5 metres) with larger, showier flowers. The two are related members of the Malvaceae family with overlapping medicinal uses, but Althaea officinalis is the species with the established European pharmacopoeial monograph and significantly higher mucilage content in the root (around 30% in the related species versus approximately 5-11% in Althaea officinalis). Huang Shu Kui (黄蜀葵, Abelmoschus manihot) is another Malvaceae plant sometimes confused with Shu Kui species; it has different properties and clinical applications (primarily used for kidney disease). Kosteletzkya virginica (seaside mallow) has similar flowers and may be mistaken for marshmallow in wild settings.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any herb.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Yao Shu Kui

Non-toxic

Yao Shu Kui is classified as non-toxic in both Chinese and Western herbal traditions. Classical sources for the related Shu Kui describe it as "甘，寒，无毒" (sweet, cold, non-toxic). The root contains calcium oxalate, salicylic acid, and coumarins in small amounts. While large amounts of calcium oxalate can theoretically cause oral and throat irritation, the quantities present in normal medicinal preparations of marshmallow root are considered safe. The high mucilage content (5-11% by weight) actually serves as a protective demulcent, coating mucous membranes. Coumarins are present in trace amounts insufficient to cause harm at standard dosages. No significant toxicity concerns exist at recommended doses.

Contraindications

Situations where Yao Shu Kui should not be used or requires extra caution

Avoid

Pregnancy: The herb has a cold, slippery (滑) nature that may stimulate uterine activity. Classical sources for the related Shu Kui (蜀葵) explicitly note that pregnant women should avoid use.

Caution

Spleen and Stomach deficiency cold (脾胃虚寒): The cold, slippery nature of this herb can further weaken digestive function and worsen loose stools or diarrhea in individuals with cold-pattern digestive weakness.

Caution

Concurrent use with blood-thinning medications: The herb contains coumarins and salicylic acid compounds that may theoretically potentiate anticoagulant effects.

Caution

Concurrent use with hypoglycemic medications: The herb may lower blood sugar levels, creating a risk of additive hypoglycemia when combined with diabetes medications.

Caution

The mucilage content may delay absorption of other oral medications. Separate administration by at least one hour.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Contraindicated in pregnancy. The herb has a cold, slippery (滑) nature that classical TCM sources warn may adversely affect the fetus. The Si Chuan Zhong Yao Zhi (《四川中药志》) explicitly states that pregnant women should avoid the closely related Shu Kui flower. Given the similar properties and chemical profile of Yao Shu Kui, the same caution applies. There is insufficient modern safety data to confirm safe use during pregnancy.

Breastfeeding

No specific safety data exists for use of Yao Shu Kui during breastfeeding. While the herb is generally considered gentle and non-toxic, the presence of small amounts of salicylic acid and coumarins means there is a theoretical possibility of these compounds passing into breast milk. In Western herbal traditions, marshmallow is generally regarded as safe during lactation at standard doses, but caution is advised. Consult a qualified practitioner before use.

Children

In Western herbal traditions, marshmallow root is considered one of the gentler herbs and has historically been used for children's coughs and digestive troubles. However, specific pediatric dosage guidelines in TCM are not well established for this particular herb. As a general principle, children's doses should be reduced proportionally based on age and body weight (typically one-third to one-half of the adult dose for children aged 6-12, and one-quarter for younger children). The mucilage content may interfere with absorption of other medications, so separate administration times should be observed.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Yao Shu Kui

Anticoagulant/antiplatelet medications (warfarin, aspirin, clopidogrel): Yao Shu Kui contains small amounts of coumarins and salicylic acid compounds. These may theoretically potentiate the effects of blood-thinning drugs, increasing the risk of bleeding. Concurrent use requires caution and monitoring.

Hypoglycemic agents (metformin, insulin, sulfonylureas): Some research suggests marshmallow root may lower blood sugar levels. Combining it with diabetes medications could theoretically increase the risk of hypoglycemia. Blood sugar should be monitored more closely if used concurrently.

Oral medications in general: The high mucilage content of marshmallow root may form a physical barrier in the gastrointestinal tract that delays or reduces absorption of other orally administered drugs. It is advisable to take other medications at least one hour before or after taking marshmallow root preparations.

Dietary Advice

Foods and dietary considerations when taking Yao Shu Kui

Avoid excessively cold, raw, or greasy foods while taking this herb, as these may impair the Spleen's digestive function, which is already stressed by the herb's cold nature. When using Yao Shu Kui for throat or cough complaints, warm soups and lightly cooked foods support the herb's soothing effects. Avoid spicy, overly hot foods if the herb is being used to clear Heat and cool Blood, as these would counteract its therapeutic direction.

Botanical Description

Physical characteristics and morphology of the Yao Shu Kui source plant

Yao Shu Kui (Althaea officinalis L.) is a perennial herbaceous plant in the Malvaceae (mallow) family, growing up to about 1 metre tall. The stems are erect and densely covered with star-shaped (stellate) coarse hairs. The leaves are ovate to heart-shaped, 3-8 cm long and 1.5-6 cm wide, sometimes with 3 shallow lobes, with rounded serrated edges and dense stellate velvety hairs on both surfaces. The flowers are pale pink with 5 petals, about 2.5 cm in diameter, appearing singly or in clusters in the leaf axils or in terminal racemes. The fruit is a round, kidney-shaped schizocarp about 8 mm across, wrapped in the persistent calyx and covered with short soft hairs.

The plant is native to Europe, Western Asia, and North Africa, and is naturalized in damp areas, marshes, and riverbanks. In China, it has been found growing wild along the banks of the Yimiele River in Tacheng County, Xinjiang Province, and has been cultivated in botanical gardens in Beijing, Nanjing, Kunming, and Xi'an. The name Althaea derives from the Greek word altho meaning "to heal," reflecting its long history of medicinal use. It should not be confused with Shu Kui (蜀葵, Althaea rosea), the common hollyhock, which is a distinct species.

Sourcing & Harvesting

Where Yao Shu Kui is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Autumn (after the aerial parts die back) or early spring (before new growth begins), typically after 2-3 years of plant growth. In China, for the related Shu Kui, winter harvesting is traditional.

Primary growing regions

Yao Shu Kui (Althaea officinalis) is native to Europe, Western Asia, and North Africa, particularly the Mediterranean coastal regions. In China, it grows wild along the banks of the Yimiele River in Tacheng County, Xinjiang Province. It has been introduced and cultivated in botanical gardens in Beijing, Nanjing, Kunming, and Xi'an. The best quality medicinal marshmallow root in international trade traditionally comes from Eastern Europe (particularly Hungary, the Czech Republic, and the Balkans) and parts of Western Asia (Iran, Turkey). There is no established 道地药材 (dào dì yào cái) designation within the Chinese tradition for this species, as it is not a major herb of the classical Chinese pharmacopoeia.

Quality indicators

Good quality Yao Shu Kui root should be long, thick, and tapered with a tough exterior. Fresh roots are yellowish in colour. When dried, the root slices should be pale whitish-yellow and produce copious mucilage (a slippery, gel-like substance) when moistened with water. The more mucilage produced, the higher the quality. The taste should be mildly sweet and mucilaginous. The root should have a faint, mild aroma without any musty or mouldy smell. Avoid roots that are overly dark, hollow, or show signs of insect damage. Cross-sections should appear fibrous and uniform without blackened centres.

Classical Texts

Key passages from the classical Chinese medical texts that describe Yao Shu Kui and its therapeutic uses

Yao Shu Kui (药蜀葵, Althaea officinalis) itself has very limited representation in the major classical Chinese materia medica texts, as it is primarily a European and Western Asian species that was not widely available in ancient China. Most classical references pertain to its close relative Shu Kui (蜀葵, Althaea rosea), the hollyhock, whose root shares similar properties and from which TCM knowledge is partly extrapolated.

The closely related Shu Kui root (蜀葵根) is referenced in several classical works:

  • 《本草拾遗》(Supplement to the Materia Medica): 「甘，寒，无毒。」"Sweet, cold, non-toxic." 「根及茎，并主客热，利小便，散脓血恶汁。」"The root and stem both treat visiting Heat, promote urination, and disperse pus, Blood, and foul fluids."
  • 《本草述》(Description of the Materia Medica): 「气味甘，微寒滑，无毒。」"The flavour is sweet, slightly cold and slippery, non-toxic."
  • 《本草推陈》(Promoting the Materia Medica): Records that it treats erysipelas (丹毒), fire sores (火疮), burns (烧伤), and edema (水肿).

Historical Context

The history and evolution of Yao Shu Kui's use in Chinese medicine over the centuries

Yao Shu Kui (药蜀葵, Althaea officinalis) has a remarkably long and cross-cultural history of medicinal use. Its genus name Althaea comes from the ancient Greek word althainein (ἀλθαίνειν), meaning "to heal" or "to cure," while the species name officinalis indicates its established place in the apothecary's shop. It was valued in ancient Egyptian, Greek, and Roman medicine as a soothing demulcent for irritated tissues. Historically, the sugary mucilaginous material in the roots was the original ingredient used to make the confection now known as "marshmallows," though modern versions contain none of the actual plant.

Within the Chinese context, Yao Shu Kui is a relatively recent introduction. Chinese Flora records indicate it grows wild only in a limited area of Xinjiang, and it has been cultivated in Chinese botanical gardens primarily for research and ornamental purposes. Its close relative Shu Kui (蜀葵, hollyhock) has a much deeper history in Chinese medicine, appearing as early as the Er Ya (《尔雅》), one of the oldest Chinese dictionaries, under the names 菺 and 戎葵. Li Shizhen described it extensively in the Ben Cao Gang Mu (《本草纲目》), noting that different flower colours (red and white) were selected for different therapeutic applications: red flowers for red (bloody) vaginal discharge, white flowers for white (leucorrhoeal) discharge.

Modern Research

3 published studies investigating the pharmacological effects or clinical outcomes of Yao Shu Kui

1

Anti-inflammatory and Anti-oxidative Effects of Phytohustil® and Root Extract of Althaea officinalis L. on Macrophages in vitro (In vitro study, 2020)

Bonaterra GA, Schwarzbach H, Kelber O, Weiser D, Kinscherf R. Frontiers in Pharmacology, 2020, 11, 290.

This laboratory study investigated the anti-inflammatory and antioxidant effects of marshmallow root extract on human macrophages (immune cells). The researchers found that the root extract reduced inflammation markers and oxidative stress in activated immune cells, supporting the traditional use of marshmallow root for soothing irritated mucous membranes and treating coughs.

PubMed
2

Phytochemical Characterization of Low Molecular Weight Constituents from Marshmallow Roots and Inhibiting Effects on Human Hyaluronidase-1 (In vitro study, 2017)

Sendker J, Böker I, Langer I, et al. Journal of Natural Products, 2017, 80(2), 290-297.

This study characterized the chemical composition of marshmallow root extract and tested its effects on human hyaluronidase-1, an enzyme involved in tissue inflammation. The extract inhibited the enzyme and downregulated its gene expression in skin cells, providing a biochemical basis for the herb's traditional use in treating irritated and inflamed oral and throat tissue.

PubMed
3

Marshmallow Root Extract for the Treatment of Irritative Cough: Two Surveys on Users' View on Effectiveness and Tolerability (Observational surveys, 2018)

Fink C, Schmidt M, Kraft K. Complementary Medicine Research, 2018, 25, 299-305.

Two observational surveys assessed the real-world use of marshmallow root extract (Phytohustil) for irritative dry cough. Users reported good effectiveness and tolerability, with rapid onset of symptom relief. While not a controlled trial, the surveys documented widespread positive clinical experience with the herb for cough treatment.

PubMed

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.