D-mannose did not reduce recurrent urinary tract infections compared with placebo in a 2024 randomized trial of women in UK primary care. That finding does not explain an individual episode, but it is a reason to review supplement use and a prevention plan with your clinician. JAMA trial
What recent research says about D-mannose and recurrent UTIs
In a 2024 randomized trial of 598 women with recurrent UTIs in UK primary care, daily D-mannose did not significantly reduce clinically suspected infections compared with placebo. The authors concluded that it should not be recommended for prevention in this group. These findings concern prevention, not an explanation of every individual episode. JAMA trial
In that study, 51.0% of women in the D-mannose group and 55.7% of women in the placebo group had at least one clinically suspected UTI, a difference that was not statistically significant. The authors concluded that D-mannose should not be recommended to prevent recurrent UTIs in women like those who were studied. JAMA Internal Medicine trial
The trial enrolled 598 women receiving care in UK primary care settings who already had a history of recurrent urinary tract infections, making the findings directly relevant to many people who consider D-mannose to prevent repeated episodes. JAMA Internal Medicine trial
Why D-mannose may not be helping you
Frequent urinary symptoms while taking D-mannose call for medical evaluation, rather than assuming that a different supplement schedule will help. In a 2024 trial in UK primary care, daily D-mannose did not significantly reduce clinically suspected UTIs compared with placebo among women with recurrent infections. JAMA trial
Because of these findings, D-mannose should not replace proper medical evaluation and treatment when you have symptoms of a UTI, and it should not be relied on as your only prevention strategy for recurrent infections. JAMA Internal Medicine trial
Safer next steps if you keep getting UTI symptoms
Repeated UTI symptoms are a reason to see a healthcare professional rather than just changing supplements. They can evaluate your symptoms, decide whether you need urine testing, prescribe an antibiotic if you have a UTI, and work with you on a longer term prevention plan tailored to your situation. CDC guidance
According to the CDC, a healthcare professional will prescribe an antibiotic to treat a UTI; if you do not have UTI symptoms you usually do not need antibiotics. They also advise seeking care for one or more symptoms of a possible UTI and say that people with recurrent UTIs should have a prevention plan made with a clinician. CDC guidance
At a visit for recurrent UTI symptoms, you can:
- Describe how often your symptoms occur and how they were treated.
- Tell your clinician which products, including D-mannose, you have tried and whether you use any gentle vaginal cleaners for internal care.
- Ask for a clear plan for testing, treatment, and prevention.
Everyday habits that can lower UTI risk
Simple daily habits can lower your chance of getting another UTI, even though they cannot guarantee prevention. The CDC recommends staying well hydrated, urinating after sexual activity, choosing showers instead of baths, and avoiding douching, sprays, or powders in the female genital area as ways to reduce UTI risk. CDC guidance
- Stay well hydrated so you produce urine regularly during the day. Source
- Urinate after sexual activity, and consider building a simple post-sex routine to lower UTI risk.
- Choose showers instead of baths when possible.
- Avoid douching and minimize sprays or powders in the female genital area, and if you prefer, use a gentle internal cleansing solution that does not disrupt normal hygiene.
The CDC notes that these behaviors can lower the risk of urinary tract infections but do not guarantee prevention, so you may still need medical care even if you follow them carefully. CDC guidance
When urinary symptoms need prompt care
Sometimes UTI symptoms point to a more serious kidney infection that needs prompt care. The CDC advises seeking medical help urgently if you develop fever, chills, or pain in your back along with UTI symptoms, because these can be signs that the infection has moved toward the kidneys. CDC guidance
The CDC also recommends seeking care for one or more symptoms of a possible UTI rather than waiting a long time to see whether they clear on their own. CDC guidance
| Situation | What to do |
|---|---|
| Any new urinary symptoms that worry you | Contact a healthcare professional for advice and possible testing. |
| Fever, chills, or back pain together with UTI symptoms | Seek medical care the same day; these can be signs of a kidney infection. |
If you feel very unwell at any point, or cannot keep fluids down, seek urgent or emergency medical care immediately.
How to talk with your clinician about stopping D-mannose
If you have been taking D-mannose, it is reasonable to bring new evidence to your next appointment and ask whether to stop it. You can explain that a 2024 randomized trial found no benefit over placebo for preventing recurrent UTIs, and ask what prevention options make sense instead. JAMA Internal Medicine trial
You might mention that in this study, 51.0% of women taking daily D-mannose and 55.7% of women taking placebo still had at least one clinically suspected UTI, so the authors concluded D-mannose should not be recommended to prevent recurrent infections in women like those studied. JAMA Internal Medicine trial
To make the most of that conversation, you could:
- List how often you have had UTI symptoms in the past year and how they were treated.
- Describe how long you have been using D-mannose and any changes you noticed.
- Ask for a clear, evidence-informed plan to prevent future UTIs, including whether options like vaginal estrogen for recurrent UTIs are appropriate for you, and how this fits alongside pH-balancing feminine mists or other comfort products.
Decisions about starting or stopping supplements and medicines are safest when you make them together with a clinician who knows your overall health, other medications, and personal risk factors.
