Whole herbsExterior-releasingHerba Moslae

Xiang Ru (Mosla)

A practical guide to Xiang Ru: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.

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Last reviewed Oct 13, 2026

Quick Facts

Latin NameHerba Moslae
Chinese Name & Pinyin 香薷 · Xiang Ru
Medicinal PartWhole herbs
The herbXiang Ru is the dried aerial part of Jiang Xiang Ru. Huo Xiang and Ma Huang are different official drugs.
Nature and channelsAcrid, slightly warm. Enters the Lung and Stomach. Acridity induces sweat and releases the exterior. Slight warmth transforms dampness and harmonizes the middle.
Pharmacopoeia lineInduces sweat and releases the exterior. Transforms dampness and harmonizes the middle. Used for summer-damp common cold, chills and fever, headache with no sweat, abdominal pain with vomiting and diarrhea, and inhibited urine.
Pattern cuesSummer-damp with no sweat. Chills and fever. Abdominal pain with vomiting and diarrhea. Inhibited urine.
In this articleXiang Ru versus Huo Xiang, Zi Su Ye, and Ma Huang. No sweat versus already sweating. Why exterior deficiency should not be forced. Who should skip it.

What Is Xiang Ru?

Xiang Ru (香薷; Xiāng Rú; Latin: Moslae Herba; English: Chinese mosla herb) is the dried aerial part of Mosla chinensis Maxim. ‘Jiangxiangru’, also called Jiang Xiang Ru. In Chinese medicine it is a slightly warm, acrid exterior-releasing herb. It is acrid and slightly warm, enters the Lung and Stomach channels, and its core actions are to induce sweat and release the exterior, and to transform dampness and harmonize the middle. Older texts call it “ephedra of the summer months.” It is specific for summer-damp common cold with chills, fever, and no sweat. It is not Huo Xiang. Patchouli aromatically transforms dampness, harmonizes the middle, and stops vomiting. It sweats weakly. Xiang Ru more clearly induces sweat and releases the exterior. It is not Ma Huang. Ephedra is acrid-warm and fierce, and leans toward winter wind-cold. Xiang Ru is slightly warm and leans toward summer-damp. Exterior deficiency with sweating is a contraindication.

It is used most often for three patterns:

  • Summer-damp common cold — chills and fever, headache, no sweat
  • Abdominal pain with vomiting and diarrhea — summer-damp injuring the middle
  • Inhibited urine — it can also drain dampness

The usual decoction dose is 3–10 g. Acrid and slightly warm, it is not a daily “summer mosla tea” to keep drinking after sweat has already come. Forcing sweat when there is already sweat consumes qi.

When summer-damp binds the exterior and the pores are closed, chills, no sweat, and vomiting with diarrhea are common. Xiang Ru is acrid-warm. It induces sweat, transforms, and harmonizes the middle, which is why it appears in Xiang Ru San. It moves to the exterior more than it holds. Spontaneous sweat, shortness of breath, thirst, and a red tongue become more depleted if more sweating is forced.

Xiang Ru is not a catch-all summer herb. In exterior-deficiency sweating or yin deficiency with heat, using it alone can consume qi and damage yin. Whether it belongs in Xiang Ru San should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Xiang Ru Aromatic Madder

Xiang Ru: Materia Medica Profile

Identification & Quality Standard

Herba Moslae

Botanical Origin

The dried aerial portion of Mosla chinensis Maxim., Mosla chinensis ‘Jiangxiangru’.(Lamiaceae)

Production Regions

Primarily produced in the Chinese provinces of Fujian, Hunan, Guangdong, Guangxi.

Quality Requirements

Superior medicinal material has tender branches, numerous spikes, potent aromatic odor.

Macroscopic Features

Whole body is 14~30cm long, covered white downy hairs. Stem often branched, square shape, near base is round, 0.5~5mm diameter; externally yellowish-brown, near base often brownish-red, obvious joints, internode is 2~5cm long; brittle texture, easily broken, fractured surface is pale yellow, opposing leaves, often fallen off, wirnkles or broken, intact leaf is narrow or lanceolate after flattened, 0.7~2.5cm long, about 4mm wide, edge has loose saw-teeth, yellowish-green or dark green; brittle texture, easily broken. Flower whirl densely gathered in head-shape; bract covered white downy hairs; clayx is bell-like, 5 lobes ant the apex; corolla wrinkled or fallen off. Pyrene opposing 4 fruits, covered inside the persistent calyx, potent aromatic odor, acrid and cooling taste. Cultivated piece is 35~60cm long, loosely covered relatively long hairs; stem is relatively thick, internode is 4~7cm long.

3 Authentic Origins and Quality Identification

While traditional texts favor specific regions, the quality also heavily depends on the plant variety, harvest time, and storage.

  • Origins: Major producing areas include Hebei, Henan, Anhui, and Jiangsu.
  • Visual Check: High-quality raw Xiang Ru (Chinese Mosla) has thin, yellow-green stems, abundant leaves, a soft texture, and a very strong, rich aroma.
  • Poor Quality: If stored too long, it turns yellow-brown, becomes brittle, and loses its signature scent.
  • Fakes to Watch For: It is sometimes confused with similar plants in the same family, such as Hai Zhou Xiang Ru (Elsholtzia). The fake versions usually have narrower leaves and a much weaker smell. Always buy from reputable sources.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Acrid, Sweet; WarmLungStomach

1. 2 Historical Herbal Records

  • Shen Nong Ben Cao Jing: Listed as a medium-grade herb, noting its use for severe stomach upset, abdominal pain, vomiting, and restlessness.
  • Ming Yi Bie Lu: Noted its ability to reduce water swelling and remove bad body odors.
  • Ben Cao Gang Mu: Famously called it the "Ma Huang (Ephedra) of the summer." This highlights its crucial role in treating summer colds, just as Ma Huang is used for winter colds.
  • De Pei Ben Cao: Clarified its modern use—treating summer colds caused by excessive cooling (like drinking ice water or staying in AC rooms), which trap "cold" in the body and lead to headaches, fever, chills, thirst, and digestive upset.

2. 3 Evolution of Pharmacological Understanding

Throughout history, doctors have debated how strongly to use this herb:

  • The Strong View: Some doctors argued it should only be used for robust individuals suffering from summer wind-cold and internal dampness, strictly warning against using it for people who sweat easily or have weak constitutions.
  • The Gentle View: Others believed that in very small doses, combined with gentle digestive herbs, it could help wake up a sluggish summer appetite.
  • Clinical Takeaway: Because it promotes sweating, modern TCM stresses using it carefully. Overusing it in the hot summer can cause excessive sweating and drain your energy. It requires a proper diagnosis before use.

Xiang Ru Aromatic Madder

Core Efficacies & Traditional Applications

Traditional Functions

Promotes sweating, resolves summerheat, moves water, disperses dampness, warms stomach, adjust the middle. Apply to affection of exotenous wind-cold in summer, headache and fever, aversion to cold without sweat, chest fullness and abdominal pain, vomiting and diarrhea, edema, beriberi.

1. 1 First Primary Action: Releasing the Exterior and Resolving Dampness

Xiang Ru (Chinese Mosla) is traditionally used to expel "cold" pathogens from the body's surface through its spicy and warming nature, while simultaneously clearing internal "dampness" to restore normal digestive function.

  • Common Symptoms: It is highly effective for summer ailments caused by excessive cooling (like blasting the AC or drinking too much ice water). Symptoms include headaches, chills, lack of sweat, body heaviness, fatigue, poor appetite, mild nausea, bloating, and a white, greasy tongue coating.
  • Common Pairings: For mild summer cold and internal dampness, it is often combined with mild herbs like Hou Po (Magnolia Bark) and Bai Bian Dou (White Hyacinth Bean) to enhance digestion and clear dampness. For very mild discomfort, a small amount can be brewed as a standalone tea.
  • Caution: Do not use this herb if you sweat easily, or if you have Yin deficiency (symptoms like dry mouth, internal heat, or dry stools). Using it can worsen these conditions by promoting unnecessary sweating.

2. 2 Second Primary Action: Harmonizing the Center and Clearing Summer-Heat

Its second major function is to balance the Spleen and Stomach, relieving digestive upset caused by summer "damp-heat" and reducing the feeling of physical heaviness.

  • Common Symptoms: It is ideal for "summer dampness trapping the Spleen," which shows up as loss of appetite, bloating after eating just a little, a heavy, sluggish feeling, sticky mouth, mild nausea, and a greasy tongue coating.
  • Common Pairings: It is frequently paired with spleen-strengthening herbs like Fu Ling (Poria) and Bai Zhu (Atractylodes Rhizome). To boost its summer-clearing effects, it is matched with He Ye (Lotus Leaf) or Pei Lan (Eupatorium).
  • Caution: If you have a chronically cold and weak stomach (frequent abdominal pain or loose stools) or severe damp-heat (yellow, greasy tongue coating), you should not use this herb alone. Always consult a practitioner for a balanced formula.

3. 3 Common Single Herb Pairing: The Herb Pair

A classic and highly effective pairing is Xiang Ru (Chinese Mosla) and Hou Po (Magnolia Bark).

  • Synergy: These two herbs work in perfect harmony. Xiang Ru excels at opening the body's surface to release cold and clear dampness, while Hou Po specializes in drying internal dampness and relieving bloating.
  • Use Case: Together, they address both the surface-level chills and the internal digestive blockages, making them perfect for summer colds caused by cold exposure, accompanied by bloating, nausea, and loss of appetite.
  • Note: This combination requires a professional TCM diagnosis. Dosages must be adjusted based on your underlying health and constitution.

Xiang Ru Aromatic Madder

Modern Research

Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.

1. 1 Primary Chemical Components

Modern science shows that the plant's active properties largely come from its essential oils.

  • Key Compounds: It contains volatile oils like carvacrol, thymol, limonene, and linalool, alongside flavonoids and organic acids.
  • Lab Observations: In test-tube studies, these essential oils show antibacterial effects. Animal tests suggest the extracts might help promote urination and regulate gastrointestinal movement. However, these specific effects lack robust human clinical trials.

2. 2 Modern Pharmacological Research Directions

Current scientific research is mostly focused on extracting and identifying the essential oils to test their antibacterial and anti-inflammatory properties in a lab setting. It remains largely in the experimental phase and needs more human studies to connect lab results with traditional uses.

3. 3 Limitations of Modern Research

When reviewing modern studies on this herb, keep these limits in mind:

  • Lab vs. Real Life: Results in petri dishes or mice do not directly equal the effects in the human body.
  • Extracts vs. Whole Herbs: Lab tests use highly concentrated, single chemicals. In traditional use, the whole Xiang Ru (Chinese Mosla) is boiled, creating a gentler, multi-compound effect.
  • Methodology Differences: Different studies use different extraction methods (pure oil vs. water teas), making results hard to compare.
  • Holistic View: The therapeutic power of a TCM herb comes from the synergy of all its parts, not just one isolated chemical.

Xiang Ru Aromatic Madder

Comparing Similar Herbs

1. 2 Similarities with Comparable Herbs

Both Xiang Ru (Chinese Mosla) and Bo He (Peppermint) are widely used to clear summer discomfort and relieve surface-level symptoms.

  • They are both commonly used in summer teas to relieve mild seasonal ailments.
  • Both must be used with attention to your body constitution; taking too much of either can lead to unwanted side effects.

2. 3 Core Differences

  • Nature and Flavor: Xiang Ru is spicy and slightly warm. It falls under the "wind-cold dispersing" category and focuses on driving out cold and dampness. Bo He is spicy and cool. It belongs to the "wind-heat dispersing" category and focuses on clearing heat and soothing the head and eyes.
  • Action Focus: Xiang Ru is best for summer colds caused by seeking too much cold (like AC or cold drinks), resolving cold on the outside and dampness on the inside. Bo He is best for wind-heat from sun exposure, addressing sore throats, red eyes, and heat-induced headaches.
  • Energy Movement: Xiang Ru uses its warmth to push out cold-damp blockages in the surface and digestion. Bo He uses its cooling nature to vent heat outward and clear the upper body (head and throat).
  • Target Symptoms: Choose Xiang Ru for chills, lack of sweat, heavy body, poor appetite, and a white tongue coating. Choose Bo He for fever, headaches, sore throat, dry mouth, and a yellow tongue coating.
  • Contraindications: Xiang Ru is bad for heavy sweaters and those with dry heat. Bo He is bad for people with cold stomachs, frequent diarrhea, or a tendency to feel chilly.
  • Common Usage: Xiang Ru is paired with herbs like Hou Po (Magnolia Bark) for cold-damp stomach issues. Bo He is usually paired with Ju Hua (Chrysanthemum) or Jin Yin Hua (Honeysuckle Flower) for summer heat and sore throats.

3. 4 One-Sentence Summary

Xiang Ru (Chinese Mosla) is the warm choice for clearing cold and dampness from too much AC or cold drinks, while Bo He (Peppermint) is the cool choice for venting wind-heat and soothing the head and throat.

Xiang Ru Aromatic Madder

Classical Formulas Containing Xiang Ru

Formulas vs. Single Herbs

  • Synergy is Key: A formula is a balanced team. The healing power comes from how the herbs interact, so a single herb cannot simply replicate a full formula's effects.
  • Holistic Balance: The exact dosage and combination in a formula affect the entire body. Never try to mix or alter these formulas at home based on internet articles.

Diet & Daily Home Use

1. 1 Home Tea or Dietary Application

  • Example: Xiang Ru and Mint Tea.
  • Ingredients: 3g Xiang Ru (Chinese Mosla), 2g Bo He (Peppermint), 1 slice of fresh ginger.
  • Method: Wash the Xiang Ru and ginger, place them in a cup, and steep in boiling water for 5 minutes. Add the Bo He at the end and steep briefly before drinking.
  • Use Case: Ideal for summer days when you experience a mild headache, a feeling of physical heaviness, poor appetite, or slight nausea after spending too much time in air conditioning.
  • Not Suitable For: People who sweat easily, have Yin deficiency (dry mouth, internal heat), or suffer from a cold, weak digestive system with frequent diarrhea.
  • Note: Drink this 1 to 2 times a week, 1 cup at a time. Do not drink it daily. Remember that Xiang Ru is a medicinal herb, not a standard daily tea, and should be treated with care.

2. 2 Preparation Differences

  • Raw vs. Processed: There is little difference, and it generally doesn't require special processing for home use.
  • Cooking Method: Because Xiang Ru is rich in aromatic essential oils, it must be added at the very end of the boiling process (the last 5 minutes). Boiling it for too long destroys its volatile oils and medicinal effects.
  • Standard Decoction: Soak your other herbs for 30 minutes, bring to a boil, then simmer for 15 minutes. Add the Xiang Ru during the final 5 minutes.
  • Warning: Clinical prescriptions use specific dosages tailored to your body. You cannot simply swap a professionally prescribed formula with a casual home tea.

3. 3 Dosage and Usage Cycle

  • Dosage: Traditional clinical doses range from 3–10g. For home dietary use, keep it much lower, around 2–5g.
  • Usage Cycle: Do not use this herb continuously for more than 3 days. If your symptoms do not improve, stop using it and consult a doctor.
  • Vulnerable Groups: Pregnant women, children, and the elderly must consult a healthcare professional before use. Never self-prescribe for these groups.
Xiang Ru Aromatic Madder

Contraindications & Safety Warnings

1. 1 Not Suitable For

  • Heavy Sweaters & Dryness: Avoid if you sweat easily with minimal activity, or if you have signs of Yin deficiency (dry mouth, dry throat, constipation).
  • Vulnerable Populations: Pregnant or nursing women must consult a doctor first. Children and the elderly have lower tolerance levels and should use it with extreme caution.
  • Organ Impairment: People with abnormal liver or kidney function should avoid self-medicating, as it may affect metabolism.
  • Allergies: Avoid if you are allergic to plants in the Lamiaceae (mint) family.
  • Medical Treatments: If you are undergoing treatments like chemotherapy or taking other medications, consult your doctor before use.

2. 2 Drug Interactions and Dietary Notes

  • Medication Interactions: The essential oils in Xiang Ru may affect how your body absorbs or metabolizes certain Western medications, including blood thinners, blood pressure meds, diabetes medications, and sedatives. Always consult a doctor if you are on long-term medication.
  • Dietary Safety: Avoid randomly mixing potent herbs with specialized diets or other medications without professional guidance.

3. 3 Adverse Reactions and Risks

  • Overdose Risks: Taking too much can lead to excessive sweating, which drains your body's energy. This can cause fatigue, heart palpitations, dry mouth, or stomach issues like nausea, vomiting, and bloating.
  • Seek Immediate Help: Stop using the herb immediately and see a doctor if you experience severe discomfort, allergic reactions, persistent vomiting, difficulty breathing, or if your symptoms rapidly worsen.

Frequently Asked Questions About Xiang Ru

What is Xiang Ru? Are Huo Xiang, Zi Su Ye and Bo He the same?
Official Xiang Ru (香薷) is the dried aerial part of Mosla chinensis (Qing Xiang Ru) or Mosla chinensis ‘Jiangxiangru’. The pharmacopoeial name is Moslae Herba. Huo Xiang is acrid and slightly warm: transforms damp, stops vomiting and resolves summerheat. Zi Su Ye is acrid-warm: releases the exterior, disperses cold, moves qi and harmonizes the Stomach. Bo He is acrid-cool: disperses wind-heat and clears the head and eyes. Write Xiang Ru. Use caution in exterior vacuity with sweating.
What are the TCM properties and traditional uses of Xiang Ru?
According to the Chinese Pharmacopoeia, Xiang Ru is acrid and slightly warm, enters the Lung and Stomach channels, and acts to induce sweating and release the exterior, transform damp and harmonize the center. It is used for summerheat-damp common cold, aversion to cold with fever, headache without sweating, abdominal pain with vomiting and diarrhea, edema and inhibited urination. Acrid-warm and sweating, it suits yin-summerheat without sweat—not exterior vacuity with spontaneous sweating or pure summerheat thirst.
How do you choose Qing Xiang Ru versus Jiang Xiang Ru? Can Huo Xiang replace it?
Both are official sources and similar in action; Jiang Xiang Ru is more aromatic. Patchouli transforms damp and resolves summerheat with weaker sweating; it cannot replace inducing sweating and releasing the exterior by equal weight. Mint is acrid-cool and cannot replace yin-summerheat without sweat.
What is the usual dosage? Can it be drunk daily as a summerheat tea?
The pharmacopoeial decoction dose is 3–10 g. Tradition favors cool administration; a hot drink easily causes vomiting. It is not a four-season “Xiang Ru summerheat tea.” With sweating or pure summerheat, inducing sweat only injures fluids. Summerheat-damp without sweat needs a practitioner to name a short course.
What are the contraindications? Can it be used in pregnancy?
Avoid in exterior vacuity with sweating. Use caution in pure summerheat thirst and yin vacuity. Pregnancy needs a practitioner’s assessment. Stop if profuse sweat and palpitations appear. High fever with convulsions and severe vomiting-diarrhea with dehydration are emergencies.
Can Xiang Ru induce sweating, release the exterior, transform damp and harmonize the center?
It can help yin-summerheat without sweat. Aversion to cold, fever, headache without sweat and abdominal pain with vomiting and diarrhea join Magnolia bark and white hyacinth bean in Xiang Ru San. Early summerheat-warmth with renewed cold appears in Xin Jia Xiang Ru Yin. It induces sweating, releases the exterior, transforms damp and harmonizes the center—not a specific for every heatstroke or every diarrhea.
Can Xiang Ru be drunk daily as a summerheat, antidiarrheal or anti-edema tea?
Summerheat-damp without sweat and abdominal pain with vomiting and diarrhea may enter a short formula; exterior vacuity only collapses further as it induces sweat. “Xiang Ru must resolve summerheat” does not replace dehydration and infection assessment. Inducing sweating, releasing the exterior, transforming damp and harmonizing the center should name 3–10 g taken cool.
How do you choose among Xiang Ru, Huo Xiang, Zi Su Ye, Bo He and Pei Lan?
Mosla is acrid and slightly warm: induces sweating, releases the exterior, transforms damp and harmonizes the center—yin-summerheat without sweat, vomiting, diarrhea and edema. Patchouli is acrid and slightly warm: transforms damp, stops vomiting and resolves summerheat—weaker sweating. Perilla leaf is acrid-warm: releases the exterior, disperses cold, moves qi and harmonizes the Stomach—wind-cold with qi stagnation. Mint is acrid-cool: disperses wind-heat and clears the head. Eupatorium is acrid-neutral: transforms damp and resolves summerheat. Yin-summerheat without sweat favors Xiang Ru (Xiang Ru San); damp obstruction with vomiting favors Huo Xiang; wind-cold qi stagnation favors Zi Su Ye; wind-heat favors Bo He; summerheat-damp with a greasy mouth favors Pei Lan. They may be paired; exterior vacuity with sweating forbids large Xiang Ru.
Which herbs is Xiang Ru combined with? What are the representative formulas?
Yin-summerheat without sweat joins Magnolia bark and white hyacinth bean in Xiang Ru San. Summerheat-warmth with renewed cold joins honeysuckle, Forsythia and Magnolia bark in Xin Jia Xiang Ru Yin. Write Xiang Ru 3–10 g, taken cool.
How do you choose and store Xiang Ru?
Choose fine stems and small leaves with a strong fresh aroma and a slightly acrid, cool taste. Moldy, moth-eaten, scentless or dirty lots are discarded. Store cool and dry. Buy pharmacopoeial Xiang Ru; do not replace inducing sweating, releasing the exterior, transforming damp and harmonizing the center with Huo Xiang or Zi Su Ye by equal weight.

Medical Disclaimer — This article is provided for educational purposes only and describes traditional Chinese medicine concepts. It is not medical advice, and it is not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified practitioner before using any herb, particularly if you are pregnant, nursing, taking medication or managing a diagnosed condition.

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Xiang Ru (Aromatic Madder): Induce Sweating, Transform Dampness, and Resolve Summerheat