Is Agnus castus really good for periods?

A.Vogel Vitex Agnus Castus is a plant that helps regulate the menstrual cycle.  Its action on the pituitary gland helps stimulate the adequate secretion of progesterone and estrogens, by the ovaries.  It helps with period regularity as well as with PMS symptoms linked to monthly hormonal changes.

Vitex can also be very useful in the pre-menopausal stage, when women are still having fairly regular periods, by allowing a progressive, gentler hormonal transition. When women are in the post-menopausal stage, when there are no more periods, Vitex is of no benefit since the ovaries have become inactive and the adrenals have taken over.