SM Herbals offers Calcium Sennosides. SM Herbals specializes in the Extraction, Isolation and Purification of Phytochemicals. Calcium Sennosides are hydroxyanthracene glycosides derived from Senna [Cassia angustifilia] leaves and pods. Sennosides are natural, safe and time-tested laxatives. The Calcium Sennosides is light brown powder and is used to treat constipation.