Chinese Thoroughwax

Botanical

What is it

Chinese thoroughwax (Bupleurum chinense), known as chai hu in TCM, is a perennial herb whose root is used in traditional Chinese medicine for liver support, fever, and emotional balance.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Liver support (traditional use, mostly in formulas)

Mixed Evidence

Bupleurum is widely used in TCM liver formulas. Most clinical evidence is for multi-herb combinations rather than bupleurum alone.

How it works

Bupleurum root contains saikosaponins (triterpenoid saponins), flavonoids, and polysaccharides. Saikosaponins have anti-inflammatory effects, hepatoprotective activity in animal models, and immunomodulating properties. In TCM, bupleurum is the chief herb in many famous formulas (such as Xiao Yao San, Xiao Chai Hu Tang) used for emotional, digestive, and gynecological complaints. Most modern clinical evidence relates to these multi-herb formulas rather than bupleurum alone.

Dosage

No established RDA. Traditional doses are 3-12 g of dried root as a decoction. Extracts in supplements vary; follow product labeling.

When and how to take it

WHEN: Often 2-3 times daily as part of TCM formulas. HOW: As a decoction, tincture, or capsule with water.

2 commercial forms

Compare the main delivery options and what they’re best suited for.

Dried root powder/decoction

Used in TCM formulas.

Traditional form; saponins are partially absorbed.

Standardized extract

Modern supplement form.

Concentrated saikosaponin content.

Safety

Generally safe in traditional doses for short to medium-term use. Side effects can include drowsiness, increased bowel movements, and (rarely) elevated liver enzymes with very long-term high-dose use.

Who should be cautious

Avoid during pregnancy. Use cautiously with chronic liver disease and immunosuppressants. Discuss with a clinician before long-term use.

Interactions

May enhance effects of sedatives. Possible interaction with interferon therapy. Saikosaponins may affect CYP enzyme activity.

Frequently asked questions

Is bupleurum safe for the liver?⌄

At traditional doses, yes; however, rare case reports of liver enzyme elevation with high-dose long-term use exist. Standard short-to-medium-term use under guidance is reasonably safe.

References

Chinese Thoroughwax on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Chinese Thoroughwax (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.