Estriol (ES-tree-all) E3/Estradiol (es-tra-DYE-ole) E2 Estriol and estradiol are hormones derived from soy or yams and may be given to patients who no longer produce a sufficient amount on their own. The combination of estriol and estradiol may be referred to as biest. It may be used to reduce menopausal symptoms (e.g., hot flashes, vaginal dryness). It may be used to help prevent bone loss. It may also be used for other conditions as determined by your doctor.
