Assertion: birth control's estrogen | /r/HasProperty | the combination pill
Facets:
Source sentences:
text: Three kinds of birth control use estrogen: the combination pill, the patch, and the vaginal ring.
text: Birth control pills that contain both estrogen and progesterone (known as combination pills) are the most effective acne fighters .
text: If your concern is efficacy, but you would like to minimize the side effects of estrogen, the best compromise is to try a low dose, or low estrogen, combination birth control pill.