It is a medical fact that progesterone and estrogen keep each other in balance. In fact, premenstrual syndrome (PMS), irregular menstruation, menstrual cramps and a tendency toward miscarriage may be at least partially caused by an imbalance of these two hormones—too much estrogen and too little progesterone. For this reason, women with PMS or uterine fibroids are sometimes given progesterone to adjust this imbalance. In a study conducted at the Johns Hopkins University, in which a group of women were given 800 International Units of vitamin E for ten weeks, results showed that vitamin E corrects the progesterone-estrogen ratio, increases a woman's libido and normalizes her menstrual cycle.
While we are on the topic of hormonal balance, let's not overlook the liver. Ask any herbalist: Liver herbs such as burdock and dandelion often help women with hard-to-treat health problems. This is because the liver deactivates estrogen, especially the carcinogenic form, which tends to settle in breast and uterine tissue. For more information on herbs to help maintain the health of your liver, see chapter 45.