Assertion: oral contraceptive | /r/MadeOf | estrogen
Facets:
Source sentences:
text: Combined oral contraceptives (COCs) contain an estrogen and a progestin to prevent ovulation (the release of an egg from an ovary), thin the uterine lining, and thicken cervical mucus making it impenetrable to sperm.
text: Some studies in women who use combined oral contraceptives that contain both estrogen and a progestin have reported an increase in the risk of developing breast cancer, particularly at a younger age and apparently related to duration of use.
text: A 2013 meta-analysis of 26 studies indicated that the use of oral contraceptives containing both progesterone and estrogen increased people’s risk of developing a blood clot.