Although the outcome for any given individual cannot be predicted, the clinical studies conducted in China indicate that about 70% of all cases of infertility (male and female) treated by Chinese herbs resulted in pregnancy or restored fertility. Depending on the particular study and the types of infertility treated, success rates ranged from about 50% up to more than 90%. Included in these statistics are cases of infertility involving obstruction of the fallopian tubes, amenorrhea, absent ovulation, endometriosis, uterine fibroids, low sperm count, nonliquification of semen, and other causes. In China, due to the greater experience with using herbs, the ability to directly integrate traditional and modern methods of therapy, and the willingness of individuals to consume relatively large doses of herbs, the success rates are probably somewhat higher than can be achieved in the U.S. at the present time. Nonetheless, U.S. practitioners have had many experiences of success in treating infertility.