Estrogen is produced by the ovaries and adrenal glands. Men also produce low levels by conversion of testosterone.
Estrogens (estradiol, estrone and estriol) are the primary female sex hormones. Estradiol is the most biologically active.
When estrogen is declining women experience symptoms of menopause. But the decline is not limited to the discomfort of menopause. Estrogen protects against colon cancer, osteoporosis, heart disease, stroke, memory loss, urinary tract infections. Also it increases the good cholesterol and lowers the total cholesterol.
All these benefits can be seen with bio-identical hormones replacement. Synthetic hormones carry multiple side effects because the body recognizes them as foreign substances.
Estrogen replacement therapies include but not limited to creams, patches and oral.
Estrogen is needed in small amounts for normal sexual function. Too little estrogen can have the same effect as too little testosterone. Also may affect the brain and bone density. Too much estrogen in men can increase risk of heart attacks and may affect prostate gland.