From the Manufacturer:
A small herb resembling a buttercup and native to the North American continent, black cohosh has a history of use for women’s health issues dating back to Native Americans. Today it finds widespread usage for gynecological issues from menstruation to menopause. It is particularly useful for menopausal symptoms due to its estrogenic effect on the body. Although the mechanism black cohosh uses is not fully understood, researchers have identified several key ingredients believed to be responsible for its effect on the female reproductive system. Black cohosh contains two compounds, actein and cimifugoside, which scientists believe play an active role as natural estrogen-like substances in the body.
Numerous studies over the past 40 years have helped establish the efficacy of black cohosh as a treatment for menopausal symptoms. The American College of Obstetrics and Gynecology has recommended the use of black cohosh for menopausal symptoms such as sleep disturbances, mood swings and hot flashes.