ANSWER: Fruits such as cranberries, blueberries, and peaches are high in D-mannose.
In fact, cranberries are the richest source of D-mannose, with approximately 36-38 milligrams of D-mannose per 100 grams of fresh cranberries. Blueberries and peaches also contain significant amounts of D-mannose, with approximately 9-10 milligrams per 100 grams of fresh blueberries and 2-3 milligrams per 100 grams of fresh peaches.
In addition to these fruits, D-mannose can also be extracted from these fruits and produced commercially in a laboratory setting. It is commonly used as a dietary supplement to help prevent and treat urinary tract infections (UTIs).