White peony, Angelica sinensis, Radix Rehmanniae Praeparata and Rhizoma Ligustici Chuanxiong are used together to tonify and regulate Blood, and do not have the effect of clearing heat. White peony, Angelica sinensis, Radix Rehmanniae Praeparata and Rhizoma Ligustici Chuanxiong are used together to form Four Substances Tang. In Four-Wu Tang, Radix Rehmanniae Praeparata is sweet, warm and thick, nourishing the kidneys, filling the marrow, benefiting the essence and generating blood; Radix Angelicae Sinensis tonifies and harmonizes the blood, the ministerial herb; Radix Paeoniae Alba nourishes the blood, softens the liver, and astringes the yin, which is compatible with Radix Rehmanniae Praeparatae and Radix Angelicae Sinensis, and has the effect of nourishing and tonifying the yin and the blood and can ease the urgency of the pain (relieving urgent pain), the adjuvant; Rhizoma Ligustici Chuanxiong activates blood and moves qi, which enables all the herbs to tonify the blood and not stagnate the blood. The combination of the four herbs makes Four Substances Tang effective in tonifying and regulating Blood, and is often used clinically to treat dizziness, palpitations (rapid heartbeat, often accompanied by panic), insomnia, or irregular menstruation in women, with scanty or closed menstruation, and pain in the umbilicus and abdomen caused by deficiency of Ying and Blood. It is recommended that patients in need take the correct medication under the guidance of a doctor.