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Bupleurum (Chai Hu)

Bupleurum chinense
Evidence Level
Limited
2 Clinical Trials
5 Documented Benefits
2/5 Evidence Score

Bupleurum (Chai Hu) is a foundational herb in traditional Chinese medicine, where it appears in classical formulas such as Xiao Chai Hu Tang for liver-channel support and emotional regulation. The root contains triterpene saponins called saikosaponins (notably saikosaponins A and D), along with polysaccharides, lignans, and essential oils. Preclinical research has documented hepatoprotective, anti-inflammatory, and immunomodulatory activity for saikosaponins, with most direct human evidence coming from multi-herb formulas rather than isolated bupleurum. Bupleurum is used in TCM-informed formulas for liver support, immune balance, and stress-related digestive symptoms.

Studied Dose Traditional: 3-9 g/day dried root in decoction. Standardized extracts: 200-500 mg/day.
Active Compound Triterpene saponins (saikosaponins A, C, D, F), polysaccharides, flavonoids, lignans, essential oils; some extracts standardized to total saikosaponins.

Benefits

Supports healthy liver function

Saikosaponins help support normal hepatic enzyme activity and resilience, contributing to a healthy liver response to everyday metabolic and dietary load.

Supported by Trial 2, Trial 1

Promotes balanced immune response

Bupleurum polysaccharides and saikosaponins help modulate innate immune signaling, supporting balanced cytokine production and immune readiness.

Supported by Trial 2

Helps maintain a calm mood

Traditionally used to relieve a sense of constraint, bupleurum is featured in formulas that support emotional balance during periods of stress and tension.

Supported by Trial 2, Trial 1

Supports digestive comfort under stress

Used in classical formulas for stress-related digestive distension and discomfort, bupleurum helps support the gut-brain-liver axis during demanding periods.

Supported by Trial 2, Trial 1

Antioxidant and inflammatory support

Saikosaponins demonstrate antioxidant activity in laboratory models and help the body maintain a balanced inflammatory tone.

Supported by Trial 2

Mechanism of action

1

Saikosaponin hepatoprotection

Saikosaponin A and D help protect hepatocytes from chemical injury in animal models by supporting glutathione status, modulating Kupffer-cell activation, and reducing lipid peroxidation.

2

Immunomodulation via polysaccharides

Bupleurum polysaccharides engage pattern-recognition receptors and modulate macrophage activity, influencing both innate and adaptive immune responses.

3

HPA-axis modulation

Preclinical studies suggest saikosaponins modulate HPA-axis signaling and corticosterone responses, contributing to traditional stress-related uses.

4

Anti-inflammatory NF-κB inhibition

Saikosaponins inhibit NF-κB activation and downstream production of pro-inflammatory cytokines such as TNF-α and IL-6 in laboratory models.

Clinical trials

1
Sho-saiko-to (Xiao Chai Hu Tang) in hepatitis C

Single-arm phase II study of the bupleurum-containing TCM formula

n=24 adults with chronic hepatitis C ineligible for interferon

Daily intake of the bupleurum-containing formula was associated with improvements in liver-enzyme levels and pathology in a subset of participants, with manageable tolerability. This is the most cited modern human evidence for bupleurum-containing formulas in liver health, though viral-load responses were mixed.

2
Bupleurum review of human and preclinical data

Comprehensive pharmacology review of approximately 50 Bupleurum species and ~250 isolated compounds

Mixed in vitro, animal, and limited human evidence

The review documents reproducible hepatoprotective, anti-inflammatory, and immunomodulatory activity for saikosaponins, while noting that most rigorous human evidence comes from multi-herb formulas rather than isolated bupleurum extracts.

Side effects and drug interactions

Common Potential side effects

Mild gastrointestinal upset, nausea, or loose stools can occur at higher doses.
High-dose or prolonged use of isolated saikosaponins has been linked to hepatotoxicity in animal studies.
Possible drowsiness or sedation in sensitive individuals.
Rare allergic reactions including skin rash.
Headache occasionally reported during early use.

Important Drug interactions

Interferon-based therapies: Sho-saiko-to has been associated with rare pulmonary adverse events when combined with interferon.
CYP450 substrates: saikosaponins may modulate select CYP enzymes and influence drug clearance.
Immunosuppressants: theoretical interaction via immunomodulatory polysaccharides.
Anticoagulants: bupleurum may have additive effects on bleeding risk in high doses.

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Frequently asked questions about Bupleurum (Chai Hu)

What is bupleurum used for?

Bupleurum (chai hu) is a foundational Chinese herb used in many classic formulas for liver support, stress and mood balance, and immune and digestive regulation. It is rarely used alone, almost always within a formula.

What is bupleurum good for?

Traditionally it is used to smooth the flow of qi, supporting liver function, easing tension and irritability, and balancing digestion, and it appears in famous formulas for stress and women's health. Its saikosaponins are key compounds.

How much bupleurum should I take?

It is almost always used within traditional formulas under practitioner guidance rather than alone; follow product or practitioner direction.

Is bupleurum safe?

Within traditional formulas it is generally considered safe. There have been rare reports of liver effects with certain Japanese herbal combinations containing bupleurum, so those with liver conditions or on medication should use it only with professional guidance.

What is Bupleurum?

Bupleurum (Chai Hu) is a foundational herb in traditional Chinese medicine, where it appears in classical formulas such as Xiao Chai Hu Tang for liver-channel support and emotional regulation.

What is the recommended dosage of Bupleurum?

The clinically studied dose is Traditional: 3-9 g/day dried root in decoction. Standardized extracts: 200-500 mg/day. Always follow the product label and check with a healthcare provider for personal advice.

Is Bupleurum safe, and does it have side effects?

For most healthy adults, Bupleurum is well tolerated at studied doses. Reported effects can include: Mild gastrointestinal upset, nausea, or loose stools can occur at higher doses. High-dose or prolonged use of isolated saikosaponins has been linked to hepatotoxicity in animal studies. It may also interact with some medications. Bupleurum is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Bupleurum interact with any medications?

Possible interactions include: Interferon-based therapies: Sho-saiko-to has been associated with rare pulmonary adverse events when combined with interferon. CYP450 substrates: saikosaponins may modulate select CYP enzymes and influence drug clearance. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Bupleurum?

NutraSmarts rates the evidence for Bupleurum as Limited (2 out of 5). It is backed by 2 clinical trials and 2 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(2 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Deng G, Kurtz RC, Vickers A, Lau N, Yeung KS, Shia J, Cassileth B. A single arm phase II study of a Far-Eastern traditional herbal formulation (sho-sai-ko-to or xiao-chai-hu-tang) in chronic hepatitis C patients. J Ethnopharmacol. 2011;136(1):83-7. doi: 10.1016/j.jep.2011.04.008.PubMedUsed to support: Phase II human trial of the bupleurum-containing TCM formula Sho-sai-ko-to in chronic hepatitis C patients ineligible for interferon, showing improvements in liver enzymes and pathology in a subset of participants.
  2. Ashour ML, Wink M. Genus Bupleurum: a review of its phytochemistry, pharmacology and modes of action. J Pharm Pharmacol. 2011;63(3):305-321. doi: 10.1111/j.2042-7158.2010.01170.x.PubMedUsed to support: Comprehensive review of ~50 Bupleurum species documenting saikosaponin chemistry and reproducible hepatoprotective, anti-inflammatory, and immunomodulatory activity; emphasizes need for standardization.