This plant's scientific name is derived from the Greek "agnos castos," meaning "pure, chaste." The Greek natural historian Pliny professed that vitex "checks violent sexual desire." This notion was perpetuated in Medieval Europe, where monks used the seeds of the chaste tree to stamp out sexual urges.
Today chaste tree berries are used to regulate female hormonal cycles. They are used both to shorten long periods and to lengthen short ones. Chaste tree berry is considered an emmenagogue, or an herb used to bring on delayed menstruation. It may also be effective in relieving the symptoms associated with PMS, such as breast pain and cramps, as well as the hot flashes of menopause.
Chaste tree berries should always be avoided during pregnancy, due to their ability to stimulate menstruation.