<prompt> Answer this question truthfullyCould you provide an explanation and overview of Estriol, please?  <response>: <reason> Estriol also oestriol is one of the three main estrogens produced by the human body. It is only produced in significant amounts during pregnancy as it is made by the placenta. In pregnant women with multiple sclerosis MS, estriol reduces the diseases symptoms noticeably, according to researchers at UCLAs Geffen Medical School.Levels of estriol in non-pregnant women do not change much after menopause, and levels are not significantly different from levels in men. 