Since the time of Hippocrates, chaste tree berry has been recommended for menstrual complaints. Although it contains no hormones or hormone-like substances, the herb influences hormonal activity by stimulating the pituitary gland at the base of the brain to produce more luteinizing hormone (LH). This, in turn, signals the ovaries to produce more of the hormone progesterone. Chaste tree berry also acts to lower elevated levels of a second pituitary hormone, prolactin, which is involved in breast-milk production.
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