How does sunscreen work? Can it really prevent wrinkles and cancer?

It’s summer, and before you head to the beach or pool, you might slather on sunscreen. But is it doing anything?

[July 29, 2021: American Chemical Society]

It’s summer, and before you head to the beach or pool, you might slather on sunscreen. But is it doing anything beyond preventing a sunburn? Can it really prevent wrinkles and skin cancer?

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