You might think of pregnancy when you think of estrogen. In women of child-bearing age, it gets the uterus ready to receive a fertilized egg. However, estrogen has other roles as well, like controlling how your body uses calcium, which strengthens bones and raises good cholesterol in the blood.
Combination therapy, which combines doses of estrogen and progesterone, is meant for women who still have their uterus.
But only Bio-identical Hormones are suggested as they are plant based and mirror your natural hormones, without using synthetic substances.