3. Purple Grape Juice
Purple grape juice, made from red grapes, is naturally high in revesatrol, which is found in the grape’s skin. Resveratrol is a polyphenolic compound that is a natural antioxidant. A single 5-ounce serving of red grape juice has between 0.17 and 1.3 milligrams of resveratrol. Like vitamin C, it protects your cells from damage from free radicals, potentially aiding in slowing down the aging process. The Linus Pauling Institute also notes that resveratrol may be beneficial in increasing life span, although the studies have been done only on animals and insects, so further research is needed to understand if resveratrol may have the same effect on humans.