Where do the active ingredients in birth control pills come from? how do they work?

Synthetic Hormones: The Estrogen and Progesterone in Birth-control pills now-days is usually a synthetic. These hormones are manufactured to similar to the Estrogen and Progesterone your body makes. Birth-control pills work by suppressing ovulation. As a back-up, if you do ovulate, these hormones affect cervical mucus and the fallopian tubes in ways that still usually prevent conception. Best wishes!