Senna is a natural herb whose leaves come from the Cassia senna plant. The leaves and the fruit of the plant are used to make medicine. Senna tea is a popular herbal remedy made from the leaves of the senna plant (typically Cassia acutifolia or Cassia angustifolia). The active ingredients are compounds called anthraquinones, which are powerful laxatives. Senna herbal tea is also used by some for other indications, including weight loss. The most common application for senna tea is to stimulate bowel movements and alleviate constipation. Some people may also use senna tea to relieve discomfort associated with hemorrhoids.