On June 23, 1960, "The Pill" was approved by the FDA.
"The Pill" is composed of synthetic hormones that mimic the effects of actual estrogen and progestin in a women's body. "The Pill prevents ovulation, meaning that no new eggs are released by a woman who is taking "The Pill" as directed because her body is "tricked" into "believing" that a pregnancy has already taken place."
[Reference:
on the About.com website at:
http://inventors.about.com/library/inventors/blthepill.htm