Basic introduction to Siwu Decoction Siwu Decoction is a famous Chinese medicine prescription, which mainly consists of four medicinal materials: Rehmannia glutinosa, Angelicae Sinensis, White Peony Root and Ligusticum Chuanxiong. The \”Si Wu\” refers to these four medicinal materials. Siwu Decoction has the functions of nourishing, regulating menstruation, and nourishing blood. It is a commonly used health food and prescription for treating gynecological diseases. The effects and functions of Siwu Decoction The effects of Siwu Decoction are mainly reflected in the following 4 aspects: