Lower Estrogen Doses Are Still Effective

Birth control pills are one of the few medications that have consistently decreased in dosage without losing effectiveness.
In 1960, when the birth control pill was introduced, it contained 100 to 175 micrograms of estrogen.

In 1997, the Alesse pill made its appearance containing only 20 micrograms of estrogen. Today, the pill has 10 times less progestin than in the early models.

Together, the two hormones suppress ovulation.

This dramatically lower dose has made the pill more user-friendly and appealing, resulting in fewer estrogen-related side effects such as nausea, breast tenderness, moodiness and bloating.