Buy Susten gel contains generic progesterone as an active compound. Progesterone is a female growth hormone. It is used to control the ovulation and menstrual cycle. It is used to effect periods in women who have not yet reached the menopausal age but have stopped getting menstrual periods due to progesterone deficiency in their body. It also inhibits the overgrowth in the uterine lining in post-menopausal women who are getting estrogen by undergoing hormone replacement therapy.