ANSWER: D-mannose is a naturally-occurring sugar that is found in small quantities in a variety of fruits, such as cranberries, blueberries, and peaches.
It can also be extracted from these fruits and produced commercially in a laboratory setting. In its pure form, D-mannose is a white, crystalline powder that is soluble in water. It is commonly used as a supplement to help prevent and treat urinary tract infections (UTIs).
Some D-mannose supplements may also contain other ingredients, such as filler ingredients, flavorings, or preservatives. It is important to read the ingredient list on the supplement label to understand exactly what is in the product and to avoid any ingredients that may cause allergies or other adverse reactions.