What is the amount of Chai Hu used in Xiao Chai Hu Tang?

• A. 6g
• B. 12g
• C. 9g
• D. 15g

Answer: (B)

Chai Hu in Xiao Chai Hu Tang is used in a moderate amount to harmonize the Shaoyang pattern, balancing exterior and interior conditions without driving the action too strongly. The 12-gram dose provides enough buoyancy to move stagnation and regulate the Liver-Gallbladder alignment, while pairing with the other herbs to clear heat and resolve phlegm as needed, all without overwhelming the stomach or causing excessive clumping of effects. This middle range is what keeps the formula’s aim—gentle harmonization between exterior release and interior harmony—achieved.

If you drop the amount to a smaller dose, the formula may not adequately address the Shaoyang disharmony and could feel under-damped. Using a much larger amount pushes the formula toward the stronger, more purgative range of Da Chai Hu Tang, altering its nature away from Xiao.