Chinese Thorowax
柴胡 · Chái Hú
Eases tension, mood swings, and fever-tinged colds
Properties
CoolingCooling botanicalPungent, Bitter
What it does
Chinese thorowax eases a wired-but-stuck feeling: irritability, chest tightness, and the muggy edge of low-grade fever. In TCM, this is called liver qi depression, where your flow has jammed under stress. Thorowax frees that flow. It's the lead herb in Xiao Yao San, the classic formula for stress and PMS. Four reviews track its effects on mood, hepatitis, and metabolic conditions.
How to take it
Decoct 3–10g of dried thorowax root in water for 20 minutes. Drink 1 cup, 1–2x daily during stress flares. Most effective in formula, not solo.
Try a Xiao Yao San formula during high-stress periods or PMS
Safety
- Generally well tolerated. Prolonged high doses can stress the liver
- Skip with severe yin deficiency or during heavy bleeding patterns
- Skip during pregnancy unless practitioner-directed
- Can interact with sedatives and anticonvulsants
- Talk to your doctor before starting, especially if you take medication
Formulas it's in
Free and Easy Wanderer
逍遙散 · xiāo yáo sǎn
One of the most-prescribed TCM formulas in the world, used for stress, PMS, and the feeling of being emotionally stuck.
Minor Bupleurum
小柴胡湯 · xiǎo chái hú tāng
A foundational TCM formula for symptoms that come and go in waves. Alternating chills and fever, bad mood, sticky digestion.
Tonify the Middle & Augment Qi
補中益氣湯 · bǔ zhōng yì qì tāng
TCM's foundational formula for low energy that comes from the digestion being run-down for a long time.
Where it comes from
Chinese thorowax is one of the most-prescribed botanicals in TCM history. It's the lead herb in Xiao Yao San (Free and Easy Wanderer), one of the most-used formulas globally for stress, PMS, and irritability. The plant's Chinese name Chái Hú means 'firewood, beard,' a description of its dry, wispy upper roots. Modern reviews have explored its saikosaponins for liver protection, antiviral activity, and antidepressant effects, with promising results across hepatitis and mood disorders.