D-Mannose Powder, Value Size, 6 oz, NOW FoodsNOW Foods D Mannose Powder Dietary Supplement. Healthy Urinary Tract. Pure Powder. Washes Away Undesirable Particles. Vegetarian Vegan. 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