Cranberry juice and Concord grape juice are rich in antioxidants, flavonoids, and polyphenols that are good for your health. It has been demonstrated that these bioactive substances enhance cardiovascular health, enhance memory and cognition, and guard against diabetes. Kidney stones can have a variety of causes, but food is a big one. Cranberry juice, in instance, is believed to help dissolve kidney stones in the same way that it lowers the risk of UTIs.