Drinking more water is the simplest, best-supported step you can take to prevent urinary tract infections. In a clinical trial, women who added just 1.5 liters (about six extra cups) of water to their daily intake had 50% fewer UTIs and needed fewer antibiotics. Beyond hydration, several supplements, lifestyle habits, and medical options can further lower your risk, especially if you deal with recurring infections.
Water: The Most Effective Free Option
Extra water works by flushing bacteria out of the urinary tract before they can multiply and cause an infection. The key number from research is 1.5 additional liters per day on top of whatever you normally drink. For most people, that means aiming for a total of roughly 2.5 to 3 liters of fluid daily. You don’t need a special schedule. Spreading your intake throughout the day and not ignoring the urge to urinate is enough to keep your bladder clearing regularly.
Cranberry Products
Cranberries contain compounds called proanthocyanidins (PACs) that stop E. coli bacteria from latching onto the walls of the urinary tract. The catch is that most cranberry juices and generic supplements don’t contain enough of these compounds to make a difference. Clinical trials showing a real preventive effect used standardized cranberry extract delivering about 36 to 37 mg of PACs per day, typically split into two doses. In women with fewer than five UTIs in the prior year, this dose cut the rate of symptomatic infections by roughly 35 to 46% compared to a negligible control dose.
If you go the cranberry route, look for a supplement that lists the PAC content on the label rather than just “cranberry extract.” Cranberry juice cocktails are mostly sugar and water, and the PAC concentration is too low to be reliable for prevention.
D-Mannose
D-mannose is a simple sugar, closely related to glucose, that your body barely absorbs. Most of it passes straight into your urine, where it coats E. coli bacteria and prevents them from sticking to the bladder lining. The bacteria then get flushed out the next time you urinate. Studies have tested doses ranging from 500 mg to 2 grams daily, with 2 grams being the most common dose in prevention trials.
The evidence is promising but still limited. A Cochrane review found that the existing studies were too small and inconsistent to draw firm conclusions, rating the overall certainty of the evidence as very low. That said, D-mannose has very few side effects (occasional bloating or loose stools), which is why many people try it alongside other strategies. It only works against E. coli, which causes the majority of UTIs but not all of them.
Probiotics for Vaginal Health
UTIs in women often start when harmful bacteria from the gut colonize the vaginal area and then migrate to the urethra. A healthy population of Lactobacillus bacteria in the vagina acts as a natural defense: these bacteria produce lactic acid, compete with pathogens for space, block E. coli from attaching to tissue, and stimulate local immune responses.
A pooled analysis of clinical trials found that Lactobacillus supplements reduced the risk of experiencing at least one recurrent UTI by about 32%. The two most studied strains are L. rhamnosus GR1 and L. reuteri RC14, available in both oral capsules and vaginal suppositories. Vaginal suppositories deliver bacteria directly where they’re needed, while oral formulations are more convenient. Either form can take several weeks of consistent use before the protective effect builds up.
Vitamin C
Vitamin C acidifies urine, which creates a less hospitable environment for bacteria. The U.S. Department of Veterans Affairs health guidelines suggest 100 mg daily for prevention. That’s a modest dose, easily covered by a single supplement or a diet rich in citrus fruits, bell peppers, and berries. While the evidence is not as strong as it is for cranberry or increased water intake, vitamin C is inexpensive and low-risk, making it a reasonable addition to a broader prevention plan rather than a standalone strategy.
Hibiscus and Herbal Combinations
Hibiscus extract has gained attention in European urology guidelines as a potential UTI prevention tool. The 2025 European Association of Urology guidelines reviewed evidence on formulations combining hibiscus with other plant-based compounds. One combination (hibiscus with propolis and a plant-based gel called xyloglucan) appears to create a barrier effect on bladder walls, preventing E. coli from adhering. A meta-analysis of 178 patients confirmed this formulation reduced the risk of recurrent UTIs compared to placebo. These products are more widely available in Europe than in the U.S., but you can find hibiscus-based urinary supplements online.
Vaginal Estrogen After Menopause
If you’re postmenopausal and dealing with frequent UTIs, low estrogen levels are likely a major factor. After menopause, the tissue lining the vagina and urethra thins, and the protective Lactobacillus population drops. This makes it much easier for harmful bacteria to take hold. Vaginal estrogen (available as a cream, tablet, or ring) restores that tissue and the local bacterial balance.
In a large multicenter review, postmenopausal women using vaginal estrogen saw their average annual UTI count drop from 3.9 to 1.8, a reduction of about 52%. All three forms (cream, ring, and tablet) are supported by evidence, and the choice usually comes down to personal preference and convenience. Because the estrogen stays local rather than circulating through the body, it carries far fewer risks than oral hormone therapy.
Methenamine Hippurate
Methenamine hippurate is a non-antibiotic prescription medication that works differently from anything else on this list. In your bladder, it breaks down into formaldehyde, which kills bacteria. The conversion works best when urine is acidic (below a pH of 6), which is why some clinicians recommend pairing it with vitamin C or cranberry to lower urine pH.
A recent randomized controlled trial in older women found that methenamine hippurate reduced the frequency of UTIs requiring antibiotic treatment by about 25% compared to placebo. While that’s a more modest effect than daily preventive antibiotics, the major advantage is that methenamine doesn’t contribute to antibiotic resistance and causes only mild side effects. For people who want to avoid long-term antibiotics, it’s a worthwhile option to discuss with a provider.
Low-Dose Preventive Antibiotics
When other strategies haven’t been enough, daily or post-sex low-dose antibiotics remain the most effective medical option for preventing recurrent UTIs. The American Urological Association’s 2025 guidelines outline two main approaches.
Continuous prophylaxis means taking a small dose of an antibiotic every day (or sometimes three times a week). This is typically prescribed for six to twelve months, with periodic check-ins. Post-coital prophylaxis is for people whose UTIs are closely linked to sexual activity: you take a single low dose of an antibiotic immediately before or after intercourse. Both approaches use the same types of antibiotics at doses much lower than what you’d take to treat an active infection.
The downside is real: once you stop, UTI frequency tends to return to its previous rate. Long-term antibiotic use also carries the risk of building resistant bacteria and can cause side effects like yeast infections or digestive issues. This is why most guidelines recommend trying non-antibiotic strategies first and reserving prophylactic antibiotics for people with frequent, disruptive recurrences.
Combining Strategies
Most urologists and urogynecologists recommend layering several approaches rather than relying on any single one. A practical combination might look like increasing your daily water intake, taking a standardized cranberry supplement or D-mannose, and adding a Lactobacillus probiotic. Postmenopausal women would add vaginal estrogen to that foundation. If infections still recur despite these steps, methenamine hippurate or low-dose antibiotics become the next tier.
Urinating after sex, wiping front to back, and avoiding irritating products (douches, spermicides, scented sprays) are often repeated as prevention tips. The evidence behind each of these individual habits is weaker than for the interventions above, but they carry no cost or risk, so there’s no reason not to follow them alongside the strategies that have stronger clinical support.