Herbs that Cool the Blood

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Besides clearing heat, what is another important function of Sheng Di Huang (rehmanniae radix)?
Sheng Di Huang enriches yin and moistens dryness, treating thirst, dry mouth, and constipation (which can happen when Xue-level heat damages the fluids).

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 120 [Q381]