where is estrogen produced

Estrogen is produced mainly in the ovaries , but also in several other tissues throughout the body.

Main production sites

• Ovaries – The primary source of estrogen in people with ovaries, especially before menopause. Specialized ovarian cells (theca and granulosa cells) convert cholesterol into estrogen during the menstrual cycle.

• Placenta (during pregnancy) – Becomes a major estrogen producer once pregnancy is established, helping support the uterus, placenta function, and fetal development.

• Adipose (fat) tissue – Fat cells make estrogen from androgens via the enzyme aromatase; this becomes an important source after menopause.

• Adrenal glands – These glands above the kidneys produce small amounts of estrogen and estrogen precursors.

Other tissues that can make estrogen locally

Several organs make smaller, mostly local (paracrine/intracrine) amounts of estrogen rather than large circulating levels:

• Breast tissue and other adipose depots

• Bone (osteoblasts and chondrocytes) – Important for bone maintenance.

• Brain (including hypothalamus) – Can synthesize and release estrogen locally, influencing reproduction, mood, and cognition.

• Vascular tissue (endothelium and smooth muscle) – Contributes to local vascular regulation.

• Liver, skin, and pancreas – Produce smaller amounts that may have local effects.

Simple way to remember it

• Before menopause: Ovaries do most of the work.

• During pregnancy: Placenta takes over as a major source.

• After menopause: Fat tissue (and some adrenal and other tissues) become relatively more important sources.

Information gathered from public forums or data available on the internet and portrayed here.