Herbs that Tonify Yang

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Which herb warms Spleen yang and stops diarrhea? For early-morning diarrhea due to Spleen and Kidney yang deficiency.
Bu Gu Zhi enters the Spleen channel and is good for diarrhea due to deficiency cold.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 787. [Q1124]