D-Mannose 500 mg, 120 Capsules, NOW FoodsNOW D Mannose Capsules Healthy Urinary Tract. Washes Away Undesirable Particles. D Mannose is a simple sugar that occurs naturally in some plants, including cranberries. Although small amounts of D Mannose are metabolized by the human body, much of it is rapidly excreted in the urine. In the bladder, D Mannose can adhere to undesirable foreign substances, preventing them from sticking to the lining of the bladder. Because insubstantial amounts of D