Black cohosh has been commonly used to alleviate symptoms associated with menopause, such as hot flashes, night sweats, mood swings, and sleep disturbances. Black cohosh supplement has been suggested to have estrogenic activity, meaning it may have an effect on hormone levels in the body. However, the specific mechanisms of action are not well understood. Some women use black cohosh to help regulate hormonal imbalances. These capsules have a positive effect on bone health. Black cohosh capsules may help increase bone mineral density and prevent bone loss. Black cohosh has been used traditionally to relieve menstrual cramps and other symptoms associated with menstruation.