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OtherWeak evidence

D-mannose

Also known as: mannose

D-mannose is a simple sugar that is largely excreted in urine, where it may bind to certain bacteria and help flush them out of the urinary tract. It is used as a supplement to help prevent recurrent urinary tract infections.

What it is used for

  • Prevention of recurrent urinary tract infections – mixed, rather weak evidence
  • Treatment of an acute infection – insufficient evidence

Forms and how they differ

powder

dissolve in water, easy to dose

capsules

convenient, often 500 mg per capsule

When to take it

Dissolved in water, regularly as on the label, often in the evening.

Pairs well with

Cranberry, plenty of fluids.

Do not combine / separate

Replacing treatment prescribed by a doctor for an acute infection.

Watch out for

If you have diabetes, consult your doctor, although the effect on blood sugar is small. In pregnancy and kidney disease use only after consulting your doctor.

Safety

Do not exceed the dose stated on the label. Higher doses may cause loose stools or bloating.

Practical tip

With fever, back pain or blood in the urine, do not rely on a supplement – see a doctor.

Products containing D-mannose 3

D-mannose + CranberryextractWomen’s healthImmunityAntioxidant
D-mannose 500 mg500 mg / capsuleWomen’s healthImmunity
D-mannoseWomen’s healthImmunity
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence

Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.

Combination check

Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.

Check D-mannose with others

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Important notice

This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.