Overview
Simple sugar that binds E. coli fimbriae, flushing them from the urinary tract.
- Cranberries
- Apples
- Peaches
- D-mannose powder
Mechanism of action
E. coli FimH binds mannose preferentially over urothelium, flushing bacteria in urine.
- · Bacterial anti-adhesion
Effects on the body
Organ system effects
Comparable to nitrofurantoin for UTI prevention in one RCT.
Evidence-based benefits
Reduces recurrent E. coli UTI
Moderate evidencePotential side effects
- · Diarrhea (high dose)
Drug interactions
Supplement interactions
- A high-quality multivitaminCovers micronutrient cofactors that support most supplement pathways.
- Omega-3 (EPA/DHA)Foundational anti-inflammatory support that complements most regimens.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
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Third-party testedIndependently verified D-Mannose — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.D-Mannose third party tested NSF
CapsulesPre-measured D-Mannose capsules — easiest for travel and consistent daily dosing without scoops or scales.D-Mannose capsules
PowderBulk unflavored D-Mannose powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.D-Mannose powder unflavored
Best sellersMost-purchased D-Mannose products on Amazon — a quick way to see what's reviewed widely before you commit.D-Mannose best sellerScientific evidence8Show studiesHide studies
D-mannose for prevention of recurrent UTI
Kranjčec B, et al.
RCT of D-mannose vs nitrofurantoin vs no prophylaxis.
Comparable to antibiotics with fewer side effects.
PubMed: D-Mannose — Reduces recurrent E. coli UTI
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PubMed: D-Mannose — randomized controlled trial
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PubMed: D-Mannose — dose response
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Google Scholar: D-Mannose — clinical evidence
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