The hormone that is dominant to men is called testosterone. However, if a man has many estrogen and progesterone in his body, he may have the identifying characteristics of women. Men who have these hormones in huge amount appear to have bigger than normal male breasts, smaller body mass and some other sexual characteristics of women. Estrogen may also increase a risk of blood clotting, which can damage the proper circulation in the arteries. Significant proof suggests that long-term use of estrogen can slowly increase the risk of breast cancer. In addition, researches have also shown that there is a greater risk of breast cancer among women who use both the estrogen and the progestin. Aside from that, estrogen is also responsible for the development of the uterus and the reconstruction of bones and tissues in the bones and brain. If you maintain a safe level of estrogen in your body, it will help in the maintenance of proper blood flow; it also controls the cholesterol level and functions as an antioxidant of the body that filters harmful chemicals found in the body. This is where the information superhighway, the Internet, could be of valuable help. Many support grouped and sites dedicated to estrogen therapy could provide invaluable information to many women who are thinking about getting estrogen therapy. Forums and discussions are abound and many women could help each other out. Women who are already on their menopausal stage should take natural estrogen supplements. Studies show that normal estrogen supplement helps in preventing Alzheimer's disease. Alzheimer s disease is common to old age especially to women. Scientists have discovered that estrogen is one among the best hormones in the prevention of this disease. This includes breast development, and it is an important hormone that helps in promoting sexual vitality, relieving hot flashes, night sweats and other deficiency symptoms that go along with old age. The female body produces three major types of this estrogen, these includes estriol, estradiol, and estrone.