

Smaller concentrations are produced by the breasts, liver, adrenal glands, and other non-endocrine tissues. It is formed within the corpus luteum and developing egg follicles. The majority of the female body's estrogen - estradiol - is produced in the ovaries.


If conception occurs, estrogen is responsible for preparing the body for gestation and parturition, causing milk ducts in the breasts to widen and prepare for milk production, among other functions. In regards to the menstrual cycle, estrogen is needed to make the lining of the uterus grow and thicken in preparation for a possible pregnancy, beginning on the first day of menstruation and ending with ovulation. In essence, estrogen contributes to the well-functioning of a woman's body.
