Several everyday habits can meaningfully lower your risk of cystitis, the most common type of urinary tract infection. Drinking more water is the single best-supported prevention strategy, but choices around contraception, clothing, and certain supplements also play a role. Here’s what the evidence actually shows for each approach.
Drinking More Water
Increasing your daily water intake is the most straightforward way to reduce cystitis episodes. A clinical trial published through Harvard Health found that women who added 1.5 liters (about six extra cups) of water to their usual daily intake experienced 50% fewer episodes of recurrent cystitis and needed fewer courses of antibiotics. The logic is simple: more fluid means more frequent urination, which flushes bacteria out of the bladder before they can multiply and cause infection.
You don’t need to hit a precise number. The goal is to drink enough that you’re urinating regularly throughout the day and your urine stays a pale yellow. If you currently drink very little water, even a moderate increase can make a difference.
Cranberry Products
Cranberries contain compounds called proanthocyanidins that prevent the most common UTI-causing bacteria from sticking to the bladder wall. When bacteria can’t attach, they get washed out with urine instead of establishing an infection. A meta-analysis in Frontiers in Nutrition found that a daily intake of at least 36 mg of these active compounds produces a significant anti-adhesion effect in urine.
The catch is that not all cranberry products deliver enough of the right compounds. Cranberry juice cocktails are often diluted and loaded with sugar. Concentrated cranberry supplements designed to deliver 36 mg or more of proanthocyanidins are a more reliable option. Look for products that specify the amount on the label, since many don’t.
Avoiding Spermicides
If you use spermicide-based contraception (gels, foams, or diaphragms paired with spermicide), switching methods may reduce your cystitis risk. Spermicides containing nonoxynol-9 are directly toxic to the protective bacteria that normally colonize the vagina. When those bacteria are depleted, harmful bacteria like E. coli flourish and can migrate to the bladder.
Multiple studies have confirmed this effect. If you experience recurrent cystitis and currently use spermicides, talking to a healthcare provider about alternative contraception is one of the more impactful changes you can make.
Wearing Breathable Fabrics
Cotton underwear won’t cure a UTI, but it creates an environment that’s less hospitable to the bacteria that cause them. Cotton is breathable and absorbs moisture, while synthetic fabrics like nylon and spandex trap heat and dampness. That warm, moist environment encourages bacterial and yeast overgrowth in the vaginal area, which can increase the likelihood of infection reaching the urinary tract.
This is a low-effort change with no downside. Choosing cotton underwear (or at least underwear with a cotton-lined crotch) and avoiding tight, non-breathable clothing for extended periods helps keep the area dry.
Supporting Healthy Vaginal Bacteria
Women who rarely get UTIs tend to have vaginal microbiomes dominated by Lactobacillus, a type of protective bacteria. When Lactobacillus populations drop, E. coli and other harmful bacteria colonize the vaginal area more easily and can travel to the bladder. Anything that disrupts this balance, including spermicides, certain antibiotics, and hormonal changes, raises cystitis risk.
Probiotic supplements containing specific Lactobacillus strains have shown some promise in lab studies for inhibiting the growth of UTI-causing E. coli. However, the clinical evidence in humans is still limited, and not every probiotic on a store shelf contains strains relevant to urinary health. If you want to try probiotics, look for products that specify urinary-focused strains rather than general gut health formulas.
Vaginal Estrogen for Postmenopausal Women
After menopause, declining estrogen levels thin the vaginal tissue, raise vaginal pH, and deplete protective Lactobacillus populations. This shift makes the urinary tract significantly more vulnerable to infection. Topical vaginal estrogen (available as creams, rings, or tablets) reverses these changes by restoring tissue integrity, lowering pH, and encouraging Lactobacillus to recolonize. The result is a vaginal environment that more closely resembles its premenopausal state.
This approach is specifically relevant to postmenopausal women or those with low estrogen levels. It requires a prescription, and it’s one of the most effective non-antibiotic strategies for this group.
D-Mannose: Limited Evidence
D-mannose is a sugar found naturally in some fruits. The theory is that it binds to E. coli in the urinary tract, preventing the bacteria from attaching to the bladder wall. It’s widely marketed as a natural UTI preventive, and early pilot studies tested doses of 2 grams daily.
The reality is less convincing than the marketing. A Cochrane review, considered the gold standard for evaluating medical evidence, concluded there is currently “little to no evidence” to support or refute the use of D-mannose for preventing or treating UTIs. The few existing studies involved small numbers of participants and produced very low certainty results. It’s not necessarily harmful, but it shouldn’t replace strategies with stronger evidence behind them.
Urinating After Intercourse and Wiping Front to Back
Sexual activity is one of the most common triggers for cystitis because it can push bacteria toward the urethra. Urinating shortly after sex helps flush out any bacteria before they reach the bladder. This is a widely recommended habit, especially for anyone prone to recurrent infections.
Wiping front to back after using the toilet follows the same principle: it keeps bacteria from the rectal area away from the urethra. Neither of these habits requires any special products or prescriptions, and both reduce the mechanical introduction of bacteria into the urinary tract.