As the weather gets warmer, it's a good idea to use sunscreen to keep harmful UV rays away from our skin — but as it turns out, we don't know exactly what that protection is costing us.
New research published in the Journal of the American Medical Association on Monday suggests that the active ingredients in sunscreen aren't just sitting atop the skin but being absorbed into the bloodstream. For most things applied topically, there is a small amount that's assumed to be absorbed into the body with no real harm done; but as the new study found, much higher levels of the substances in sunscreen are absorbed than previously thought. In some cases, it may be "as much as 40 times" as much, NBC News reported.
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