Herbs that Tonify Yang

Which herb warms the Kidney to treat frequent urination, and also warms the Spleen to treat diarrhea and excessive salivation?

Yi Zhi Ren means "benefit intelligence seed." It won't make you smarted, but by stopping drooling it will make you appear more intelligent.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 789. [Q1126]