Although eating raw or cooked garlic will not affect your birth control pills, taking garlic supplements can in fact have an adverse effect on them. Many birth control pills that are on the market today contain estrogen and the body in effect breaks it down in an effort to get rid of it.

Taking garlic supplements sometimes increases this process which could possibly decrease its overall effectiveness. Those women who are on birth control and taking garlic supplements will definitely want to think about using an additional form of birth control just in case.