Ceylon cinnamon comes from a tree called Cinnamomum verum. People use the bark to make medicine.

Ceylon cinnamon is taken by mouth for gastrointestinal (GI) upset, diarrhea, gas, and irritable bowel syndrome. It is also used for stimulating appetite, for hayfever (allergic rhinitis), for infections caused by bacteria and parasitic worms, for yeast infections inside the mouth (thrush), for menstrual cramps, weight loss, the common cold, and the flu (influenza).