Yes, cranberry juice contains a naturally occurring sugar called D-mannose. D-mannose is a type of simple sugar that is present in small amounts in various fruits, including cranberries. D-mannose is often associated with its potential benefits for urinary tract health. It is believed to help prevent certain types of bacteria, particularly Escherichia coli (E. coli), from adhering to the walls of the urinary tract, which can reduce the risk of urinary tract infections (UTIs). While cranberry juice does contain D-mannose, it's important to note that the concentration of D-mannose in cranberry juice may not be as high as in certain D-mannose supplements specifically formulated for UTI prevention. If you are considering using D-mannose for urinary tract health, it may be more effective to use a D-mannose supplement with a higher concentration of the sugar. Additionally, it's worth noting that many commercial cranberry juices often contain added sugars or are blended with other fruits, which can increase the overall carbohydrate content and potentially counteract some of the potential benefits. When choosing cranberry juice, look for options with no added sugars or consider using pure cranberry juice or concentrated cranberry supplements to maximize the D-mannose content while minimizing unnecessary additives.