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, qi being your body's baseline energy, now 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 and hepatitis.
Safety
- Generally well tolerated. Bensky says it can drain your energy if you're already run down
- Skip with severe yin deficiency or during heavy bleeding patterns
- No pregnancy data either way, so check with a practitioner first
- AHPA lists no known drug interactions, but tell your doctor what you're taking
- Talk to your doctor before starting, especially if you take medication
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
Formulas it's in
Bupleurum Spread the Liver
柴胡疏肝散 · chái hú shū gān sǎn
For rib-side pain, deep sighs, and irritability when Liver qi is constrained
Drive Out Blood Stasis
血府逐瘀湯 · xuè fǔ zhú yū tāng
For the fixed, piercing pain and emotional storms of blood stasis in the chest
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.
Frigid Extremities Powder
四逆散 · sì nì sǎn
For cold hands and feet that come with stress, tension, and a tight gut.
Gentian to Drain the Liver
龍膽瀉肝湯 · lóng dǎn xiè gān tāng
A strong cooling formula for burning urination, itchy genital rashes, and red, sore eyes.
Major Bupleurum
大柴胡湯 · dà chái hú tāng
A strong harmonizing formula for relentless nausea, belly pain, and a bitter taste that won't clear.
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.
Modified Free & Easy Wanderer
加味逍遙散 · jiā wèi xiāo yáo sǎn
The variant of Free and Easy Wanderer for when liver tension has tipped into irritability and heat.
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.