What is the chief herb in Wu Ling San?

• A. Ze Xie
• B. Zhu Ling
• C. Fu Ling
• D. Gui Zhi

Answer: (A)

In Wu Ling San, the main goal is to drain dampness and promote urination to resolve water buildup, especially in the lower burner. The herb that serves as the chief agent for this diuretic action is Ze Xie. Alisma orientale directly and strongly drains dampness through the urine, targeting the lower burner where dampness tends to accumulate, which is the core mechanism behind this formula’s effect. The other herbs support this action by helping transform and move dampness, tonifying the spleen to prevent further dampness, and harmonizing the interior so water metabolism can proceed smoothly. So Ze Xie stands out as the principal ingredient driving the diuretic and dampness-draining effect of Wu Ling San.