Estrogen is also essential to normal body function, which is why women should maintain normal estrogen level in the body. Old age can be one of the reasons why women experience irregular estrogen production. Usually, when women reach old age, their body can no longer produce normal estrogen, which may lead to some bothering body malfunctions. Other researches show that estrogen also lessens the risk of cardiovascular diseases like heart disease. However, there are also researches, which presents that estrogen has no beneficial effects for heart problems. Others suggest that estrogen can protect a woman from having Alzheimer s disease, but this is not yet confirmed. Because it is stronger than Estriol it is more effective symptomatic alternative than the latter. Estrone on the other hand has the same function as the Estradiol, but it is considered to have a weaker effect. The pituitary gland and the hypothalamus is the one responsible for producing these types of hormones, and acts as the lutienizing agent in controlling its production in the body. Without it, women will not have the different characteristics that identify them as women. Estrogen production is also essential to menstruation. They are the reason why women menstruate. This is because, estrogen is found in the eggs produced by the ovaries. Usually, the normal menstrual cycle in a woman s anatomy last for twenty eight to thirty days. Osteoporosis This is one of the most feared diseases of adult women. This is the condition wherein the bones become fragile, thin and easily fractured. Many studies have shown that one cause of this unbearable disease is estrogen insufficiency. Every year, there are 500,000 U.S women suffering from osteoporosis cause by this deficiency. Most women still use estrogen pills perhaps: Have not heard anything about the life-threatening danger it could give. These women have no idea of what is happening around them. Perhaps, she did not even know that such report exists. Simply do not care at all. This may be the same as the first situation.