Calcium Sennosides are hydroxyanthracene glycosides derived from Senna (Cassia angustifilia) leaves and pods. Sennosides are natural, safe and time-tested laxatives in traditional as well as modern systems of medicine. Extensive research with Sennosides indicate that they irritate the lining of the large intestine resulting in bowel movement. Senna extracts have therefore been very successful in treating constipation.