The source is from the fruits of Psoalea corylifolia L., family Leguminosae. The medicinal material is mainly produced in Henan, Sichuan, etc., harvested in autumn and dried for use. It is used crudely or stir-baked with a salty solution.

Medicinal Properties: Pungent and bitter in flavor, warm in nature, and attributive to the kidney and spleen meridians.

Actions: Invigorate the kidney and strengthen yang, arrest nocturnal seminal emission and reduce urination with astringent drugs, and warm the spleen and stop diarrhea.

Application
1. It is applied for deficiency of kidney-yang manifested as impotence, emission, cold pain of waist and knees, frequent micturition or enuresis. For cold pain of waist and knees, it is usually used together with Duzhong (Cortex Eucommiae), Hutaorou (Juglandis Regiae), such as Qing'e Wan (Pill); for emission and impotence, with Tusizi ( Semen Cuscutae ), Hutaorou ( Juglandis Regiae ), etc., such as Buguzhi Wan (Pill); for frequent micturition and enuresis, with Xiaohuixiang (Fructus Foeniculi), such as Poguzhi Wan (Pill), that is, Buguzhi Wan (Pill).
2. For deficiency of spleen-kidney-yang manifested as chronic diarrhea, it is used together with Roudoukou ( Semen Myristicae), Wuweizi ( Fructus Schisandrae), Wuzhuyu (Fructus Evodiae), such as Sishen Wan (Pill).

In addition, it can also be made into tincture for external application to treat vitiligo and alopecia areata.

Usage and Dosage: 5 -10 g is used in decoction; or in pill or powder.

Notes: Contraindicated for hyperactivity of fire due to deficiency of yin, or for constipation.