NEWS YOU CAN USE: Slathering on Sunscreen Shows Results, Researchers Find. “People who diligently use sunscreen every day can slow or even prevent for a time the development of wrinkles and sagging skin, a new study found. Although dermatologists have long told people to use sunscreen to prevent aging, this is the first research to show an actual effect on the appearance of skin, researchers said.”

Of course, if you short yourself on Vitamin D, that can have more serious, non-cosmetic effects.