A new study has found several common ingredients in sunscreen can seep into the bloodstream at dangerous levels after just a day of use.
The levels were high enough to trigger an investigation.
A dozen chemical sunscreens were studied by the FDA.
The study claims four of the chemicals remain in the body for at least 24 hours after sunscreen use stopped.
The FDA is calling for more research before the chemicals can be considered safe.
According to experts, people should still be using sunscreen.