Substances the Calm the Spirit

Suan Zao Ren (ziziphi spinoase semen) calms the spirit, but by which way?

Herbs from the category Herbs that Nourish the Heart and Calm the Spirit generally work by tonifying Yin and Blood.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 928 [Q1174]