DES Exposure: Questions and Answers What is DES? DES (diethylstilbestrol) is a man-made (synthetic) form of estrogen, a female hormone. Doctors prescribed it from 1938 until 1971 to help some pregnant women who had had miscarriages or premature deliveries.
: https://www.cancer.org/cancer/cancer-causes/medical-treatments/des-exposure.html