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Ethynyl estradiol is a synthetic form of the naturally occurring female sex hormone, estradiol. It is a type of estrogen, which plays a crucial role in the development and maintenance of the female reproductive system. Ethynyl estradiol is commonly used as a component in various hormonal contraceptives, including birth control pills and contraceptive patches.
As a synthetic estrogen, ethynyl estradiol helps regulate the menstrual cycle and prevents ovulation. It also contributes to changes in the cervical mucus and uterine lining, making it more difficult for sperm to reach the egg and for a fertilized egg to implant in the uterus.
It's important to note that ethynyl estradiol is often combined with a progestin (a synthetic form of progesterone) in contraceptive formulations. The combination of ethynyl estradiol and a progestin provides a more effective method of preventing pregnancy compared to using either hormone alone.
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