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D-Mannose Side Effects & Safety

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Generally Safe

Potential Side Effects

  • Mild GI symptoms — bloating, loose stools, or diarrhea at higher doses (most common; it is a sugar alcohol)
  • Nausea (uncommon)
  • Generally very well-tolerated — significantly fewer side effects than antibiotic prophylaxis

Drug & Supplement Interactions

  • Diabetes medications — D-mannose is a sugar, but minimal amounts are metabolized; still, monitor blood glucose in diabetic patients
  • Antibiotics — no negative interaction; can be used alongside antibiotics for acute UTI treatment
  • Anticoagulants — no known interaction

Maximum Dose

Do not exceed: 8-10g daily during acute episodes has been used anecdotally; 2g daily is the standard preventive dose

Full D-Mannose Guide

References

  1. (). D-mannose powder for prophylaxis of recurrent urinary tract infections in women: a randomized clinical trial. World Journal of Urology. DOI
  2. (). Oral D-mannose in recurrent urinary tract infections in women: a pilot study. Journal of Clinical Urology. DOI