Psoralea Fruit Classic Formulas — Natural Herb Library

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Warms the Kidney and tonifies yang - Bu Gu Zhi is used for cold low back, weak knees, impotence, infertility, and depleted Kidney fire.
Secures essence and reduces urination - it is a standard herb for frequent urination, enuresis, spermatorrhea, and lower-burner leakage rooted in Kidney deficiency.
Warms the Spleen and stops dawn diarrhea - it is especially valued when early-morning loose stool reflects chronic Spleen-Kidney yang deficiency.
Helps the Kidney grasp qi - it is added to formulas for chronic wheezing or dyspnea when lower-source weakness prevents proper grasp of breath.

Si Shen Wan - classic dawn-diarrhea formula using Bu Gu Zhi to warm the Spleen and Kidney and secure chronic early-morning stool.
Qing E Wan - lower-back and Kidney-yang formula pairing Bu Gu Zhi with Du Zhong and other supportive ingredients for lumbar weakness.
Kidney grasping-qi lineages pair Bu Gu Zhi with Ren Shen, Hu Tao Rou, or Chen Xiang for chronic wheezing from lower-source deficiency.

TCMWiki records Bu Gu Zhi as sweet, bitter, astringent, and warm, entering the Kidney, Spleen, and Lung to warm yang, secure leakage, stop diarrhea, and relieve dyspnea.
Traditional materia medica repeatedly distinguishes its hot, drying, astringing nature from the gentler balanced Kidney tonics such as Tu Si Zi.