NSF GMP CERTIFIED: Bestvite’s facility is NSF/ANSI 455-2 Dietary Supplements Good Manufacturing Practice (GMP) certified. Earning GMP certification from NSF verifies that a manufacturing facility has the proper methods, equipment, facilities, and controls in place to produce dietary supplement products. BESTVITE GUARANTEE: All Bestvite products are manufactured in the USA according to GMP. The raw materials and all batches of the finished D-Mannose product are tested by a 3rd party laboratory for purity and potency. PURE & CORN FREE FORMULA: Bestvite D-Mannose contains no stearates, is non-GMO, gluten-free, vegan, and comes in an additive-free capsule. Unlike most D-Mannose products, Bestvite D-Mannose DOES NOT contain any corn. Each capsule contains 500 mg of pure D-Mannose. ANTIOXIDANT EFFECTS: Research suggests that D-mannose may have antioxidant properties, which may help protect cells from free radical damage. *. URINARY HEALTH: Some research suggests that D-Mannose may support urinary tract health.*.