Traditionally used in herbal medicine—especially within women’s reproductive health contexts (menstrual irregularities, PMS, fertility)
It appears to work (in part) by influencing hormone levels—such as reducing prolactin, possibly affecting progesterone, and thereby modulating the menstrual cycle.
PMS & menstrual symptoms: Some studies show chaste berry supplements can reduce symptoms like irritability, mood swings, breast tenderness, headaches in women with PMS.
Hormonal balance / cycle regulation: It may help regulate irregular menstrual cycles and support the luteal phase (second half of the cycle) in women with hormonal imbalance (e.g., elevated prolactin).
Fertility support , For some women with luteal phase defects or elevated prolactin, chaste berry has been observed to help improve chances of conception or cycle regularity.