Estrogen is a group of hormones that play a crucial role in the development and regulation of the female reproductive system and secondary sexual characteristics. It is primarily produced in the ovaries, but also in smaller amounts by the adrenal glands and fat tissues. Estrogen helps regulate the menstrual cycle, supports pregnancy, and influences various bodily functions, including bone health and cholesterol levels. In addition to its role in females, estrogen is also present in males, where it contributes to sperm production and overall reproductive health. Imbalances in estrogen levels can lead to various health issues, such as menstrual irregularities in women or reduced fertility in men.