High: Birth control pills that had at least 50 micrograms of ethinyl estradiol or 80 micrograms of mestranol had a threefold higher risk of breast cancer. (mindbodygreen.com)
Some medicines and grapefruit juice may increase the level of ethinyl estradiol in your blood if used together, including: (nuvaring.com)
And in several rivers around the world, endocrine disruptors such as ethinyl estradiol (EE2), the main component in most oral birth control pills, have been linked to the feminization of male fish. (sciencemag.org)