Senna contains many chemicals called sennosides. Sennosides irritate the lining of the bowel, which causes a laxative effect. Senna leaf acts on the intestinal walls, causing contractions that lead to bowel movements. In this regard, it can be used to effectively relieve even the most severe cases of constipation. According to Traditional Chinese Medicine, or TCM, Senna leaf extract, ... https://www.naturalcaffeine.co.in/senna-extract.html