Epmedin C, a natural product, has estrogen-like effects for ovariectomized mice. IC50 value: Target: In vitro: In vivo: Anesthetized with 0.4%pentobarbital sodium, mice of the ovariectomized group were conducted with Bilateral oophorectomy, while fat beside ovaries were removed on mice of the sham-operation group. Compared with the sham-operation group, body weight of mice of model group were significantly increased, uterus weight and uterine factor and estradiol levels were significantly reduced, which suggested a significant difference. In comparison of the ovariectomized group, body weight of mice were relieved significantly and uterus weight and uterine factor and estradiol levels were increased significantly in all Epmedin C groups [1].