As part of the research, young female rats were given the synthetic hormones found in birth control pills.
The rats' level of corticosterone, the main stress hormone, also went up.
But, what does this mean for humans?
Study Finds The Negative Effects Hormonal Birth Control Can Have On Teens
The birth control pill has been legal since 1960, but we're only just beginning to learn about the possible long-term effects it has on those who use it.
