4. Citrus Fruit Juice
All citrus fruits, including oranges, grapefruits and tangerines, are naturally high in vitamin C. Vitamin C is required to help your body produce collagen, which helps keep your skin firm and healthy, potentially helping reduce the onset of wrinkles. Vitamin C also helps your body heal from injuries, including cuts and bruises. As a natural antioxidant, it can help reduce the damage of free radicals on your body, which can speed up the aging process, including the onset of wrinkles. An orange has 70 milligrams of vitamin C per serving, a whole grapefruit has 79 milligrams and a tangerine has 26 milligrams per serving. The recommended daily dietary intake of vitamin C ranges from 75 to 120 milligrams for adults.