Herbs that Stabilize and Bind

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Which of the following is the main action of Fu Xiao Mai (tritici fructus levis)?
Fu Xiao Mai enters the Heart channel and stops sweating (spontaneous sweating from qi deficiency or night sweats from yin deficiency). Also tonifies Heart qi to calm shen.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 896 [Q1158]