Cranberries and cranberry juice are a great source for vitamins and antioxidants, and various forms of cranberry have long been used to provide urinary tract support. It is nearly impossible to consume a beneficial amount of cranberries or cranberry juice without consuming too many calories and sugar, so a cranberry supplement is a great alternative. A cranberry supplement delivers your body with all the great benefits that cranberries have to offer, without the vast amounts of sugar and calories.