Women's bodies produces estrogen in their fat cells, especially after menopause. (health.com)
The body naturally produces estrogen, as it's required hormone for health in both men and women. (yurielkaim.com)
Many women do not need to supplement estrogen until after menopause because, even though they lose the ability to produce progesterone, they are still able to continue producing estrogen for several years. (naturallybetter.com)