Swanson ® D-Mannose is a dietary supplement that is a source of D-mannose. Each capsule of the preparation allows you to supplement your daily diet with 700 mg of mannose. D-mannose - what is it? D-mannose is an organic chemical compound from the aldohexose group. In nature, it usually occurs in the form of polymers, for example in hemicelluloses and plant mucilages. UT-PRO ® D-mannose was used to produce the Swanson preparation. D-Mannose 700 mg Swanson ® is just 1 capsule a day to supplement your diet with a valuable ingredient of natural origin. A pack of 60 will last up to two months of daily use.