CHASTEBERRY (Vitex Agnus Castus) is known for its hormone balancing properties. It has been renowned since ancient times and is believed to effectively regulate the pituitary gland's functions, especially its progesterone and prolactin functions. In turn it has considerable influence on the body's hormonal balance, normalising it by enabling greater or lesser hormone release to occur and making Chasteberry one of the world's most medically interesting herbs and the subject of ever increasing study.