Lamberts® Cranberry Complex is a high potency sugar free powder concentrate produced from mature cranberries, mixed with a complex carbohydrate called fructo-oligosaccharide (FOS), extracted from chicory root. FOS acts as a prebiotic, which means it encourages the growth of friendly bacteria, which help to suppress pathogenic, troublesome bacteria. This unique combination of ingredients helps to prevent troublesome bacteria taking hold in the bladder.