Siwu Tang Wan (simplified Chinese: 四物汤丸; traditional Chinese: 四物湯丸) is a brownish-black pill used in traditional Chinese medicine to "normalize menstruation and enrich blood".[1] It is aromatic and tastes slightly sweet and bitter. It is used where there is "deficiency of blood, and irregular menstruation".[2] The name Siwu Tang Wan literally means Pill of Four Substances in Chinese.