Bupleurum, known as Chai Hu, is one of the most-used roots in Traditional Chinese Medicine (TCM), where it almost always appears inside multi-herb formulas rather than on its own. It has a long history and a growing body of laboratory research. It also carries real safety signals for the liver and lungs that most online write-ups skip. This guide covers both sides honestly.
What is bupleurum?
Bupleurum is the dried root (Radix Bupleuri) of plants in the carrot family. The main medicinal species are Bupleurum chinense and Bupleurum falcatum. One species, Bupleurum longiradiatum, is toxic and is not used medicinally. The roots contain saikosaponins, the compounds behind most of the herb's studied effects, along with flavonoids and essential oils (Ashour & Wink, 2011).
In TCM, Chai Hu is described as bitter and cooling, and is used to "harmonize" and to move what practitioners call stuck liver energy. It appears in classic formulas such as Xiao Yao San and Sho-saiko-to. Importantly, these are formulas, so the traditional effects are not attributed to bupleurum alone.
What the research actually shows
Most bupleurum research is preclinical, meaning it comes from cells and animals rather than people.
Laboratory and animal findings
Reviews of the genus report that saikosaponins show anti-inflammatory, antiviral, and liver-related activity in lab models (Ashour & Wink, 2011; Yang et al., 2017). These findings explain why the herb is studied, but they do not prove it treats disease in humans.
Liver disease in people (weak evidence)
Because Chai Hu is so tied to the liver in TCM, it has been tested there. A 2019 Cochrane review looked at the bupleurum formula Xiao Chai Hu Tang for chronic hepatitis B. It concluded the clinical effects remain unclear, with all trials at high risk of bias and the certainty of evidence rated very low (Kong et al., 2019). In plain terms: despite heavy traditional use, good evidence that it helps liver disease is missing.
Important safety cautions
This is the part most articles leave out, and it matters most.
Bupleurum can stress the liver
The irony is real: an herb famous for "liver support" can itself harm the liver. A 2017 review of Radix Bupleuri notes it can cause liver toxicity, especially at high doses and with long-term use (Yang et al., 2017). Bupleurum-containing formulas Sho-saiko-to and Dai-saiko-to have been linked to rare cases of clear acute liver injury, with relapse if the person restarts the herb (LiverTox, NIDDK).
Lung reactions
In Japan, the bupleurum formula Sho-saiko-to has been associated with interstitial pneumonia, a serious lung inflammation, particularly when combined with interferon therapy. This is a recognized reason for caution.
Who should avoid or get supervision
- Anyone with liver disease should not self-treat with bupleurum; it needs medical oversight.
- People on interferon or other prescription drugs should check for interactions first.
- Pregnant or breastfeeding people should avoid it; safety is not established.
- Use only correctly identified species from a reputable source, never wild-collected, given the toxic B. longiradiatum.
For background on choosing herbs and TCM safely, see NCCIH.
Traditional uses and preparation
In TCM, Chai Hu is traditionally used within formulas for patterns linked to digestion, mood, and alternating fever and chills. It is rarely taken alone. Typical practitioner-guided forms include:
- Decoction of the dried root, usually 3 to 12 g per day within a formula.
- Liquid extracts, tablets, or capsules at the maker's stated dose.
Because the meaningful effects and risks come from formulas and dosing, bupleurum is best used under a qualified TCM practitioner rather than self-prescribed.
For other roots used in Chinese medicine, see our guides to rehmannia and white peony, which are often combined with bupleurum in classic formulas.
Frequently Asked Questions
What is bupleurum used for? In Chinese medicine, it is used within formulas for digestive, mood, and fever-related patterns, and is closely tied to the liver. Strong human evidence for specific diseases is lacking.
Is bupleurum good for the liver? Traditionally it is used for the liver, but a Cochrane review found the clinical evidence weak, and bupleurum can actually harm the liver at high or prolonged doses. Do not self-treat liver problems with it.
Is bupleurum safe? At typical formula doses it is usually tolerated, but it carries documented liver and lung safety signals. Use it under professional guidance and avoid it in pregnancy.
Can I take bupleurum every day long term? Long-term use raises the risk of liver toxicity, so it should only be done under a practitioner's supervision.
Medical disclaimer: This article is for informational purposes only. Always consult a qualified healthcare provider before making changes to your health routine.
Sources
- Ashour ML, Wink M. Genus Bupleurum: a review of its phytochemistry, pharmacology and modes of action. Journal of Pharmacy and Pharmacology, 2011 β PubMed. https://pubmed.ncbi.nlm.nih.gov/21749378/
- Yang, et al. Radix Bupleuri: A Review of Traditional Uses, Botany, Phytochemistry, Pharmacology, and Toxicology. BioMed Research International, 2017 β PubMed. https://pubmed.ncbi.nlm.nih.gov/28593176/
- Kong DZ, et al. Xiao Chai Hu Tang, a herbal medicine, for chronic hepatitis B. Cochrane Database of Systematic Reviews, 2019 β PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC6953322/
- LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. Sho Saiko To and Dai Saiko To β National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). https://www.ncbi.nlm.nih.gov/books/NBK548777/
- National Center for Complementary and Integrative Health (NCCIH). Traditional Chinese Medicine: What You Need To Know. https://www.nccih.nih.gov/health/traditional-chinese-medicine-what-you-need-to-know
All sources accessed 26 May 2026.
