Douglas Laboratories D-Mannose Powder for urinary tract health support. Found naturally in fruits such as cranberries and pineapples, d-Mannose is a simple sugar that is absorbed slowly from the gastrointestinal tract. It is not converted into glycogen or stored in the liver. Most of d-Mannose is excreted in the urine where it supports urinary health through maintenance of a healthy environment for the mucosal surfaces. Recommended use: Take 1 scoop, 3 times daily or as directed by a healthcare professional.