In Xiao Yao San, which herb has a dosage of 3?

• A. Pao Jiang 6
• B. Gan Cao 4.5
• C. Bo He 3
• D. Bai Shao 9

Answer: (C)

In this formula, the amount of each herb reflects its role rather than equalizing strength. Bo He is the aromatic, cooling herb used to vent heat and help move liverqi upward, which is useful for the pattern Xiao Yao San treats. Because its effect is relatively strong, it’s given in a small amount to provide the needed cooling and dispersion without overpowering the other ingredients that nourish and regulate the liver and spleen. The other herbs are dosed higher because they provide the main effects: one warms and moves qi in the middle burner, another harmonizes and tonifies, and another nourishes liver blood and softens the liver. So the herb with the smaller dose is Bo He, reflecting its targeted, auxiliary role in the formula.