Does D-Mannose Actually Work for Utis?
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 25th, 2026.
D-mannose has been studied for preventing recurrent UTIs, but the evidence is uncertain, and a large recent study found that 2 grams daily did not prevent medically attended UTIs. Laboratory research suggests it may interfere with some E. coli bacteria attaching to the urinary tract, but this has not translated into a clearly proven clinical benefit. There is also not enough evidence to recommend D-mannose for treating an active UTI. However, most research involves small sample sizes and short durations. Because laboratory research has focused on how D-mannose may affect E. coli, any potential benefit would most plausibly apply to E. coli UTIs, but clinical effectiveness has not been established. D-mannose may cause side effects such as diarrhea, and its long-term safety is not well established. It should not replace evaluation and appropriate treatment for a suspected UTI; people considering it alongside prescribed treatment should discuss this with a healthcare professional.
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