Antioxidants—like Vitamin C—help turn back the clock. Studies have shown that people who use Vitamin C had fewer wrinkles and less age-related dry skin than those who didn’t. Vitamin C helps form collagen, which smooths fine lines and wrinkles. The key is C’s ability to fight free radicals, a by-product of cell metabolism in your body. Free radicals are thought to attack proteins, fats, and DNA—and break down collagen all factors in aging your skin. C also seems to guard against ultraviolet rays from the sun, which can lead to freckles and a mottled complexion. Vitamin C will repair and even firm the skin.