"Resveratrol, found in red grapes, is an antioxidant that protects the skin against free radicals [molecules that over time cause DNA damage and speed up aging], reduces inflammation and encourages cell renewal," Dr. Murad says. "That makes it an essential ingredient in shielding skin from the damaging effects of the sun." Research has shown that it also helps fight lines and erase sun damage. While vino is the most notable source, red grapes, peanuts and dark chocolate contain it, too. In addition to eating these foods, take a supplement (150 milligrams) daily to get enough resveratrol to score its benefits.