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Female hormones play a pivotal role in regulating various physiological processes throughout a woman's life, influencing reproductive health, menstrual cycles, pregnancy, and overall well-being. The primary female hormones include estrogen, progesterone, and to a lesser extent, testosterone, all of which are produced by different organs within the female body, primarily the ovaries, adrenal glands, and placenta during pregnancy. Estrogen, often referred to as the primary female sex hormone, plays a central role in the development and functioning of the female reproductive system. It is responsible for the growth and development of secondary sexual characteristics during puberty, such as breast development, widening of the hips, and the onset of menstruation. Estrogen also regulates the menstrual cycle, promoting the growth and thickening of the uterine lining (endometrium) in preparation for possible pregnancy. Beyond reproductive function, estrogen influences bone health, cardiovascular health, and cognitive function.