Roots and rhizomesExterior-releasingRadix Bupleuri

Chai Hu (Bupleurum Root)

A practical guide to Chai Hu: 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 Sep 25, 2026

Quick Facts

Latin NameRadix Bupleuri
Chinese Name & Pinyin 柴胡 · Chai Hu
Medicinal PartRoots and rhizomes
The herbChai Hu is the dried root of B. chinense or B. scorzonerifolium. Bei Chai Hu has a thicker main root. Nan Chai Hu is thinner and more aromatic. Yin Chai Hu is a different drug. Common forms: raw and vinegar-fried.
Nature and channelsAcrid, bitter, slightly cold. Enters the Liver, Gallbladder, and Lung. Acridity disperses. Bitterness drains. Slight cold reduces fever.
Pharmacopoeia lineDisperses and reduces fever. Soothes the Liver and relieves constraint. Raises yang qi. Used for common-cold fever, alternating chills and fever, chest and flank distention and pain, irregular menstruation, uterine prolapse, and rectal prolapse.
Pattern cuesAlternating chills and fever. Bitter taste and dry throat. Flank distention. Irregular periods. Sinking qi. Wiry pulse.
In this articleRaw versus vinegar-fried Chai Hu. How it differs from Yin Chai Hu, Bo He, Xiang Fu, and Sheng Ma. Dose, and who should skip it.

What Is Chai Hu?

Chai Hu (柴胡; Chái Hú; Latin: Bupleuri Radix; English: Bupleurum root) is the dried root of Bupleurum chinense DC. (Bei Chai Hu) or Bupleurum scorzonerifolium Willd. (Nan Chai Hu). In Chinese medicine it is an exterior-releasing herb. It is acrid, bitter, and slightly cold, enters the Liver, Gallbladder, and Lung channels, and its core actions are to disperse and reduce fever, soothe the Liver and relieve constraint, and raise yang qi. It is not Yin Chai Hu (Stellaria root), which clears deficiency heat and does not soothe the Liver or raise yang.

It is used most often for three patterns:

  • Shaoyang pattern / exterior fever — alternating chills and fever, bitter taste, dry throat, fullness in the chest and flanks
  • Liver qi constraint — flank pain, low mood, irregular periods
  • Sinking of qi — fatigue, shortness of breath, rectal or uterine prolapse

Raw Chai Hu leans toward releasing the exterior and reducing fever. Vinegar-fried Chai Hu leans toward soothing the Liver and relieving pain. Wine-processed Chai Hu, or Chai Hu in qi-tonifying formulas, leans toward raising yang. The usual decoction dose is 3–10 g. It is a poor fit used alone in yin-deficiency fire, ascendant Liver yang, damaged true yin, or marked rebellious qi with vomiting.

In high-stress modern life, flank tightness, premenstrual irritability, alternating hot and cold feelings, and a late-day sinking fatigue are common. Chai Hu treats the half-exterior, half-interior layer, moves Liver qi, and lifts clear yang.

That is why it appears in Xiao Chai Hu Tang, Xiao Yao San, and Bu Zhong Yi Qi Tang. It raises and courses. In yin deficiency with yang rising, more Chai Hu can mean more dryness and dizziness.

Chai Hu is not a catch-all for stress, PMS, or fever. In true-yin deficiency or Liver yang rising, or after the exterior has already released, using it alone or in large amounts can consume yin and lift yang too far. Raw or vinegar-fried, and whether the dose is for fever or for constraint, should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Chai Hu Bupleurum Root

Chai Hu: Materia Medica Profile

Identification & Quality Standard

Radix Bupleuri

Botanical Origin

The dried root of Bupleurum chinense DC. (Apiaceae).

Production Regions

Primarily produced in Chinese provinces of Henan, Hebei, Shaanxi.

Quality Requirements

Superior medicinal material is thick and long, and lacks remnants of rootlets.

Macroscopic Features

Cylindrical or long conical shape, 6~15cm long, 0.3~0.8cm diameter. Root head enlarged, apex has remnants of 3~15 stem bases or short fibrous leaf base, base has branches. Externally dark brown or pale brown, with longitudinal wrinkles, lateral root scars and lenticels. Hard but pliable texture, difficult to break; fractured surface is flaky and fibrous, with a light brown cortex, yellowish-white woody portion. faintly aromatic odor; taste slightly bitter. Superior medicinal material is thick and long, and lacks remnants of rootlets.

Regional Sources and Quality Identification

  • Authentic Sources (Dao Di): Traditionally, the highest quality roots come from Hebei, Shaanxi, Gansu, and Northeast China. However, modern quality also depends heavily on harvesting time, processing, and storage.
  • Appearance: The root is cylindrical or cone-shaped with a dark brown or light brown surface and deep longitudinal wrinkles. It is hard and tough to break.
  • Aroma & Taste: It has a slightly aromatic smell and a mildly bitter taste.
  • Usage Differences: Raw Chai Hu is generally stronger for relieving fever and dispersing external pathogens. In contrast, vinegar-baked Chai Hu is much better at soothing the Liver and relieving pain, often used for rib pain caused by Liver Qi stagnation.
  • Important Warning: Be careful of common imposters like "Da Ye Chai Hu" (Large-leaf Bupleurum). Its roots are thicker with dense rings, and it is toxic—do not use it by mistake.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Bitter; Slightly coldLiverGallbladder

1. Historical Records

  • Shen Nong's Herbal Classic notes that it targets Qi blockages in the gut, digestive accumulations, and alternating cold and heat pathogens.
  • Miscellaneous Records of Famous Physicians adds that it helps clear heat from the chest, fluid retention, and tightness caused by dampness.

2. Evolution of Clinical Understanding

Over time, TCM practitioners have focused on different strengths of this herb:

  • Soothing the Liver: Many value its ability to smooth out Liver Qi, making it a go-to for emotional stress and the physical tension it causes.
  • Harmonizing: Others highlight its role in treating pathogens stuck "halfway" in the body, which often show up as alternating chills and fevers.
  • Crucial Caution: Because it strongly lifts energy, practitioners emphasize that those with "Liver Yang rising" (often presenting as severe dizziness or flushing) should use it with extreme caution to avoid pushing too much energy upwards.
Chai Hu Bupleurum Root

Core Efficacies & Traditional Applications

Traditional Functions

Harmonizes the interior and exterior, courses the liver, resolves depression, outthrust the exterior, discharge heat, upbears yang, and raises the sunken. Apply to cold and pyrexia, spell of fever and chills, malaria, stagnation f liver and qi, gastric and costal swelling pain, anal prolapsed, uterine prolapse, irregular menses.

1. Primary Focus: Harmonizing the Exterior and Interior

  • Traditional Efficacy: It is famous for "harmonizing the exterior and interior," meaning it treats pathogens that are stuck halfway—neither fully on the body's surface nor deep within the organs.
  • Target Symptoms: Commonly used when you experience alternating chills and fever, a feeling of fullness or tightness in the chest and ribs, loss of appetite, irritability, and a tendency to vomit.
  • Common Combinations: Often paired with Huang Qin (Baical Skullcap Root). A classic example is the formula Xiao Chai Hu Tang (Minor Bupleurum Decoction), which uses both to harmonize the body and clear these halfway-stuck pathogens.
  • Caution: If you have a very weak constitution or lack foundational energy (Qi deficiency), do not use this herb on your own, as its dispersing nature can further drain your energy.

2. Secondary Focus: Soothing the Liver and Relieving Stagnation

  • Traditional Efficacy: Excellent at soothing the Liver and breaking up Liver Qi stagnation.
  • Target Symptoms: Frequently used for stress-related issues like emotional depression, mood swings, bloating or pain in the ribs and chest, and irregular menstruation.
  • Common Combinations: Often paired with Xiang Fu (Cyperus Rhizome) and Chuan Xiong (Szechuan Lovage Root) in formulas like Chai Hu Shu Gan San (Bupleurum Powder for Spreading the Liver) to enhance its pain-relieving and Qi-moving effects.
  • Caution: If your Liver stagnation has already turned into "Fire" (showing signs like extreme anger, red face, or severe heat), avoid using it alone as it might aggravate the heat.

3. Common Single Herb Pairs: Herb Relationships

  • Chai Hu + Huang Qin: Chai Hu (Bupleurum Root) lifts and disperses, while Huang Qin (Baical Skullcap Root) clears heat downwards. Together, they perfectly balance each other to treat alternating chills and fever. This requires a practitioner's diagnosis.
  • Chai Hu + Xiang Fu: Chai Hu soothes the Liver, and Xiang Fu regulates Qi and stops pain. This is a powerful duo for treating chest and rib pain caused by emotional stress and blocked Qi.
Chai Hu Bupleurum Root

Modern Research

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

1. Key Chemical Components

Modern analysis shows that Chai Hu (Bupleurum Root) contains saikosaponins, essential oils, and polysaccharides.

  • Lab Findings: In test-tube studies, saikosaponins show anti-inflammatory and antiviral activity.
  • Animal Studies: It appears to help regulate immune function and body temperature in animals. However, clinical human studies are still needed to confirm exactly how these effects translate to real-world use.

2. Modern Pharmacological Focus

Current research is heavily focused on the herb's potential anti-inflammatory, immune-regulating, and hepatoprotective (liver-protecting) properties. While lab tests suggest it may help protect liver cells and reduce damage, more human trials are necessary to verify its safety and effectiveness for specific diseases.

3. Limitations of Modern Research

  • Lab vs. Reality: Results from test tubes and animal models cannot be directly applied to humans.
  • Extracts vs. Whole Herbs: Purified extracts or isolated chemicals behave differently than traditional whole-herb preparations.
  • Inconsistent Methods: Variations in dosages and preparation methods across different studies make it hard to compare results.
  • Synergy is Key: In TCM, you cannot judge an herb by a single chemical. The healing power of Chai Hu (Bupleurum Root) comes from all its components working together as a team.
Chai Hu Bupleurum Root

Comparing Similar Herbs

1. Common Ground: Chai Hu vs. Huang Qin

  • Both Chai Hu (Bupleurum Root) and Huang Qin (Baical Skullcap Root) are used to treat pathogens stuck in the "halfway" stage.
  • They frequently appear together in the same formulas (like Xiao Chai Hu Tang) to balance each other out.

2. Core Differences

  • Properties: Chai Hu is slightly cold and focuses on lifting and dispersing. Huang Qin is cold, bitter, and focuses on descending and clearing out heat.
  • Core Strengths: Chai Hu excels at soothing the Liver and pushing pathogens out. Huang Qin excels at drying dampness, clearing intense heat, and detoxifying.
  • Target Symptoms: Choose Chai Hu for emotional stagnation, alternating chills/fever, and rib pain. Choose Huang Qin for hot conditions like damp-heat jaundice or hot lung coughs.
  • Contraindications: Chai Hu should be used cautiously by those with "Liver Yang rising" (like severe high blood pressure or dizziness). Huang Qin should be avoided by those with a cold and weak digestive system.

3. Summary of Differences

In short: Chai Hu (Bupleurum Root) is a mover that lifts energy and relieves stress, while Huang Qin (Baical Skullcap Root) is a cooler that sinks energy and clears intense heat. Even though they work great as a team, they cannot replace one another.

Chai Hu Bupleurum Root

Classical Formulas Containing Chai Hu

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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. Home Recipes & Teas

  • Chai Hu Soothing Liver Tea:
    • Ingredients: 5g Chai Hu (Bupleurum Root), 5g Xiang Fu (Cyperus Rhizome), 3g dried rose buds.
    • Method: Rinse the herbs, place them in a cup, add boiling water, and steep for 10-15 minutes.
    • Application: Great for people feeling emotionally stuck, stressed, or experiencing chest tightness.
    • Caution: Pregnant women should avoid this. Drink 2-3 times a week max. Remember, this is medicinal, not a daily hydration beverage.

2. Preparation & Brewing Differences

  • Processing: Raw Chai Hu is better for fevers and colds. Vinegar-baked Chai Hu is much better for liver and emotional issues.
  • Brewing Basics: For home decoctions, just soak the herbs in water for 20-30 minutes, then simmer on low heat for 20-30 minutes. No special boiling steps are required.
  • Forms Matter: Doses for teas, pills, or powders are all different and cannot be directly swapped.

3. Dosage & Usage Cycle

  • Standard Range: Typical clinical doses are between 3 to 10 grams. Home tea doses should be kept on the lower end.
  • Cycle: It is not recommended for long-term, continuous use, as its dispersing nature can eventually exhaust your body's energy.
  • Vulnerable Populations: Pregnant women, children, the elderly, and those with liver/kidney issues must consult a doctor before use.
Chai Hu Bupleurum Root

Contraindications & Safety Warnings

1. Who Should Avoid It

  • Specific Imbalances: People with "Liver Yang rising" (often presenting as severe dizziness, flushing, or anger) should use it with extreme caution.
  • Special Populations: Pregnant and nursing women must be careful to avoid harming the baby. Children and the elderly need professional supervision.
  • Organ Health & Allergies: Do not use if you have abnormal liver or kidney function, or if you are allergic to the plant family.

2. Medication Clashes & Dietary Notes

  • Interaction Risks: Chai Hu (Bupleurum Root) can affect how your body processes certain medications. Using it with blood thinners might increase bleeding risks, and it can interact unpredictably with blood pressure medications.
  • Professional Review: Always space out your herbal teas and Western medicines, and inform your doctor or pharmacist if you are combining them.

3. Adverse Reactions & Overdose Risks

  • Common Signs: Mild side effects can include nausea, vomiting, or diarrhea.
  • When to Seek Emergency Care: If you experience severe allergic reactions, persistent vomiting, difficulty breathing, altered consciousness, or a rapid worsening of symptoms, stop immediately and seek emergency medical help.

Frequently Asked Questions About Chai Hu

What is Chai Hu? Are Bei Chai Hu, Nan Chai Hu, Yin Chai Hu and Da Ye Chai Hu the same?
Official Chai Hu (柴胡) is the dried root of Bupleurum chinense (Bei Chai Hu) or Bupleurum scorzonerifolium (Nan Chai Hu / red Bupleurum). The pharmacopoeial name is Bupleuri Radix. Bei Chai Hu is thicker and firmer; Nan Chai Hu is thinner, redder and softer. Yin Chai Hu is a pink family root used to clear deficient heat—not Bupleurum. Da Ye Chai Hu (Bupleurum longiradiatum) is toxic, densely ringed, and must never be substituted. A script that says only “Chai Hu” is usually filled with Bei Chai Hu.
What are the TCM properties and traditional uses of Chai Hu?
According to the Chinese Pharmacopoeia, Chai Hu is acrid, bitter and slightly cold, enters the Liver, Gallbladder and Lung channels, and acts to disperse and reduce fever, soothe the Liver and resolve constraint, and raise Yang Qi. It is used for common-cold fever, alternating chills and fever, flank distention and pain, irregular menses, uterine prolapse and rectal prolapse. It is the key Shao Yang harmonizing herb; dose and processing shift the emphasis among releasing, soothing and raising.
What is the difference between raw, vinegar-fried and wine-fried Chai Hu?
Raw Chai Hu is stronger to rise, disperse and reduce fever—colds and alternating chills and fever, often at a slightly higher dose. Vinegar-fried Chai Hu is guided into the Liver and better for spreading constraint and stopping flank or menstrual pain, usually at a lighter dose. Wine-fried Chai Hu emphasizes raising sunken Qi. Turtle-blood frying for deficient heat is now uncommon. The prescription should name raw or vinegar-fried; do not treat them as identical.
What is the usual dosage of Chai Hu?
The pharmacopoeial decoction dose is 3–10 g. Toward the high end for releasing fever; toward 3–6 g for soothing the Liver or raising Yang. Excess may cause nausea or dizziness. Reduce the dose for children and Yin-deficient patients. Do not stack patent Xiao Chai Hu products with extra slices into an unsupervised “high-dose Bupleurum.” Prolonged or high-dose use, especially with existing liver disease, needs monitoring.
What are the contraindications? Does Chai Hu “rob Liver Yin”?
Use caution or avoid in true Yin depletion, Liver Yang rising and internal Liver wind. Its ascending, dispersing nature can push already-rising heat higher—red face, vertex headache, rebellious vomiting. The saying that Chai Hu “robs Liver Yin” warns against over-dispersal; at standard doses, paired with astringing herbs such as white peony and used for the right pattern, it is not a blanket “liver-damaging ban.” High-dose long courses in hepatitis or cirrhosis still warrant care, as some studies suggest a dose-related injury signal. Stop if allergy or marked nausea appears.
Can Chai Hu reduce fever and treat alternating chills and fever?
Yes. It is the signature herb for Shao Yang alternating chills and fever, classically with Scutellaria in Xiao Chai Hu Tang: bitter taste, dry throat, dizzy vision and chest-flank fullness. It can also disperse exterior fever. It is not a universal antipyretic. High fever with seizures, stupor or severe infection is an emergency. Li Gao warned against adding it when there is no heat.
Can Chai Hu soothe the Liver and regulate menses?
Yes. Liver Qi constraint with flank distention, mood tightness, irregular menses, dysmenorrhea or breast swelling is often treated with vinegar-fried Chai Hu plus Angelica, white peony and Cyperus, as in Xiao Yao San, Si Ni San and Chai Hu Shu Gan San. It spreads; it does not nourish Blood. It is not a catch-all gynecologic herb. Liver Yang rising, heat-type flooding or pregnancy needs a clinician. Mood disorders and structural disease are not solved by Bupleurum alone.
Can Chai Hu raise Yang and treat prolapse?
In small amounts it can raise clear Yang, with Astragalus and Cimicifuga, for Qi-fall rectal or uterine prolapse and chronic diarrhea, as in Bu Zhong Yi Qi Tang. Raising uses a light dose; releasing the exterior uses a little more. Do not raise with unopposed Chai Hu when Yin-deficiency fire or Liver Yang already rises. Prolapse, bleeding or pain still needs surgical or gynecologic triage. It is not a “lift-the-anus tea.”
Which herbs is Chai Hu combined with? What are the representative formulas?
With Scutellaria, Pinellia and ginger it forms Xiao Chai Hu Tang. With Angelica, white peony, Atractylodes and Poria it is Xiao Yao San. With bitter orange, white peony and Cyperus it is Si Ni San or Chai Hu Shu Gan San. With Astragalus and Cimicifuga it is Bu Zhong Yi Qi Tang. Name raw or vinegar-fried Chai Hu, and let a practitioner set the dose.
How do you choose and store Chai Hu? How do you avoid toxic look-alikes?
Bei Chai Hu is cylindrical, with an enlarged crown and leftover stem bases, black-brown or pale brown and relatively hard. Nan Chai Hu is thinner, reddish-brown, softer and slightly rancid-smelling. Vinegar-fried slices have a faint vinegar odor. Store ventilated and dry, protected from insects. Da Ye Chai Hu is a thick, densely ringed toxic rhizome. Buy only labeled Bei Chai Hu, Nan Chai Hu or vinegar-fried Chai Hu from a regulated supplier—do not confuse it with Yin Chai Hu or Da Ye Chai Hu.

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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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Chai Hu (Bupleurum Root): Release Heat, Soothe the Liver, and Raise Yang