Ingredient · Women's Health
Cranberry for bladder health: what the research says
Does cranberry help your bladder?
Cranberry has been studied for one bladder problem: repeat urinary tract infections (UTIs). A 2023 Cochrane review of 50 trials found cranberry products probably lower the risk of repeat infections in women who get them often, by about 26%. It has not been shown to treat an infection you already have, and we did not find studies showing it stops bladder leaks.
This guide is based on public health information from the NIH (NCCIH and NIDDK) and a Cochrane review, linked in the sources. It is not medical advice. How we review
What is cranberry doing in a bladder supplement?
Cranberry is a tart red berry, and its juice and extracts have been used for urinary health for a long time. The reason is not that it fixes the bladder muscle. The idea is about infections: cranberry contains compounds called proanthocyanidins (PACs), and researchers have studied whether they make it harder for bacteria to stick to the wall of the urinary tract. NCCIH (National Center for Complementary and Integrative Health, part of the US National Institutes of Health (NIH)) covers cranberry only in the context of urinary tract infections [1].
That matters for how you read a label. A supplement can list cranberry and still be aimed at something else. In FemiCore, the label lists cranberry extract standardized to 30% PACs, which is a common way to measure the active part. The maker, however, says FemiCore supports bladder control, and leaks are a different problem from infections.
Does cranberry prevent urinary tract infections?
Probably, for some women. The Cochrane review updated in November 2023 pooled 50 randomized trials with 8,857 participants. In the 8 trials of women who get repeat UTIs (1,555 women), cranberry products probably lowered the risk of a symptomatic infection: a risk ratio of 0.74, or about 26% lower. The review rates that as moderate-certainty evidence [2].
NCCIH reaches a similar but more careful place: cranberry products may lower the risk of repeat UTIs in women by about 25%, but their effectiveness is still in question because of inconsistent findings [1].
Both sources also show the limits, listed below.
| Question | What the sources say |
|---|---|
| Does it lower the risk of repeat UTIs in women? | Probably, by about 25 to 26%, with moderate-certainty evidence (Cochrane 2023; NCCIH). |
| Is the result solid? | Not fully. The Cochrane confidence range barely stays below 1 (0.55 to 0.99), and trials differed a lot from each other. |
| What dose works? | Unknown. Cochrane did not find an established PAC dose or a clear dose-response link. |
| Is it better than antibiotics? | Unknown. Cochrane says the evidence is not enough to say. |
| Does it treat an infection you already have? | No. NCCIH says cranberry is not recommended as a treatment for existing UTIs in any population. |
Does cranberry help with bladder leaks?
We did not find evidence that it does. Neither of the two sources above says cranberry stops leaks: the NCCIH page does not mention incontinence at all [1]. The NIDDK (National Institute of Diabetes and Digestive and Kidney Diseases) list of treatments for bladder control problems names lifestyle changes, bladder training, pelvic floor exercises, medicines, devices, injections, nerve stimulation and surgery, and it does not name cranberry or any other supplement [3].
Leaks and infections can feel alike, because both can mean urgency and trips to the toilet. But leaks come from muscles, tissue or nerves, and infections come from bacteria. If cranberry helps with the second, that does not carry over to the first. For leaks, our guide on why you leak when you sneeze covers what has the strongest evidence.
Is cranberry safe, and who should be careful?
NCCIH says cranberry taken by mouth is generally thought to be safe. Very large amounts can cause stomach upset and diarrhea. There is conflicting evidence about whether cranberry interacts with the blood thinner warfarin, so NCCIH advises talking with your provider before using it if you take warfarin or any other medicine [1].
If you think you have an infection (burning when you urinate, a constant urge, cloudy or bloody urine), see a provider. The NIDDK says bacterial bladder infections are usually treated with antibiotics, and to finish the whole course even if symptoms go away [4].
What does that mean for FemiCore?
FemiCore is a daily capsule that, according to the maker, supports bladder control. Its herbal blend (350 mg) includes cranberry extract standardized to 30% PACs, but the label does not say how much cranberry is in the blend, so the dose cannot be compared with what trials used. Cranberry is also only one of nine ingredients: the others include bearberry, mimosa pudica, berberine and five probiotic strains.
So the fair summary is this: the cranberry in FemiCore has research behind it for repeat infections, not for leaks, and we did not find studies of FemiCore itself. Our full FemiCore review goes through all nine ingredients, the side effects, the price and the 60-day money-back guarantee.
FemiCore is a daily capsule that, according to the maker, supports bladder control and lists cranberry extract among its ingredients. Our review covers each ingredient, the research, side effects, price and the 60-day guarantee.
Read our FemiCore reviewQuestions about cranberry and the bladder
Does cranberry juice cure a UTI?
No. NCCIH says cranberry is not recommended as a treatment for existing UTIs in any population. A provider can prescribe antibiotics.
Does cranberry prevent UTIs?
It may. A 2023 Cochrane review found that cranberry products probably lower the risk of repeat UTIs in women who get them often, by about 26%, though the evidence has limits.
How much cranberry should I take?
Nobody knows yet. The Cochrane review found no established dose of the active compounds (PACs). Follow the product label and ask your provider.
Does cranberry help with bladder leaks?
We did not find studies showing it does. Its research is about infections. For stress leaks, pelvic floor training has the strongest evidence.
Is cranberry safe with warfarin?
The evidence is conflicting. NCCIH advises talking with your provider before using cranberry if you take warfarin or any other medicine.
Can cranberry cause side effects?
Taken by mouth it is generally thought to be safe. Very large amounts can cause stomach upset and diarrhea.
Sources
Public health information and research used for this guide, checked on Oct 16, 2026.
- NCCIH (US National Institutes of Health). Cranberry. Link
- Williams G et al. Cranberries for preventing urinary tract infections. Cochrane Database of Systematic Reviews, 2023 (Cochrane summary). Link
- NIDDK (US National Institutes of Health). Treatments for Bladder Control Problems (Urinary Incontinence). Link
- NIDDK (US National Institutes of Health). Treatment for Bladder Infection (UTI) in Adults. Link
Read our FemiCore review
FemiCore is a daily capsule that, according to the maker, supports bladder control and lists cranberry extract among its ingredients. Our review covers each ingredient, the research, side effects, price and the 60-day guarantee.