Origin：From the dry root and stem of Dioscorea opposita Thunb.
Functions：Tonifying spleen, nourishing the stomach, supplementing lung and promoting the production of body fluid, reinforcing kidney and arresting seminal emission. Using in insufficiency of the spleen, reduced appetite, long-time diarrhea, weak lung to gasp and cough, kidney-deficiency to spermatorrhea, leukorrhea diseases, frequent micturition, etc.