We are offering senna leaves. Senna leaves is rich sources of anthroquinone glycosides, which are compounds that stimulate the large intestine to contract. They work by slightly irritating the lining of the colon, which leads to bowel-muscle contraction and more frequent bowel movements. Senna contains essential oils, tannins and other compounds that help deter the growth and proliferation of microorganisms such as bacteria, fungi and parasites.