New Supplement! Tame your testosterone with our new Estrogen supplement! Estrogen Is A Group Of Steroid Compounds, Important To The Estrous Cycle And Functions As The Primary Female Sex Hormone: Estradiol: Secreted Chiefly By The Ovaries. Most Potent Estrogen; Critical Impact On Reproductive And Sexual Functions; Affects Bone Structure. Estrone: An Estrogenic Hormone Secreted By The Ovary; Found Chiefly As A Metabolite Of Estradiol. Estriol: A Reduction Product Of Estrone And Estradiol. Dhea Is Converted To Estriol By The Placenta. Levels Are Usually Stable After Menopause. These estrogen drops help to increase estrogen levels. Use only as directed. One to ten drops under the tongue daily. Keep out of reach of children.