Senna is an herb that comes from several different flowering species of the Cassia plants. The leaves, flowers, and fruits of the senna plant have been used in tea as a laxative or stimulant for centuries. The leaves of the senna plant are also used in some teas to help relieve constipation or promote weight loss. It is a plant containing Sennosides. It has traditionally been used as a laxative which is clinically supported.