Naturally occuring estrogens are:a) Estroneb) Estrad iolc) Estriold) Diethylstilbesterole) Pregnanediol

Natural estrogens are C18 steroids Main Source - Theca and granulosa cells of Graafian follicle and corpus luteum. Secondary source - Adrenal cortex Naturally occurring estrogen EstradioI – Main estrogen during reproductive years, Estrone (Produced by peripheral aromatization of androstenedione) - Main estrogen after menopause Estriol (the main source is placenta) - Main estrogen during pregnancy. It is a marker of feto-maternal-placental well being.