Herbs that Relieve Food Stagnation

Which herb relieves food stagnation and also secures Kidney essence, for bed-wetting, frequent urination, and night time urination?

Ji Nei Jin secures Kidney essence and halts enuresis.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 505 [Q864]