Downward-Draining Herbs (Intro)

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Which of the following herbs moistens the Large Intestine to gently relieve constipation, making it particularly suitable for dry constipation in elderly or deficient patients, or for dry constipation due to blood deficiency in postpartum patients?
Huo Ma Ren belongs to the category Moist Laxatives. It's moist, and it's laxative. It's actions are more gentle and gradule than purgatives.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 245 [Q553]