When you use sunscreen a lot, tiny amounts of its chemicals can get into your bloodstream — but that doesn’t mean it’s dangerous. Scientists just need to study more to figure out if it matters for...

When you apply sunscreen all over your body as recommended, your body absorbs some of the chemicals in it so much that they show up in your blood within a day — more than what the FDA considers a safety concern level.

When people used sunscreen as much as possible in a study, almost 1 in 3 of them got a rash — more than any other side effect.

When you put on sunscreen with chemicals like oxybenzone or avobenzone, your body absorbs more of those chemicals into your bloodstream than the FDA thinks is safe — even if you just use it normally on your skin.

When people use sunscreen heavily—covering most of their skin and reapplying it four times a day for four days—chemicals in the sunscreen get into their bloodstream at levels higher than what the FDA says should trigger safety checks.