Cranberry products prevent urinary tract infections (UTIs) in women
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Cranberries for preventing urinary tract infections
Published 2023Reviewer Insight1/19/2026This is a review paper (systematic review of 50 RCTs with meta-analysis). However, this is NOT a categorical meta-analysis; it includes quantitative data pooling with relative risks and confidence intervals (RR 0.70, 95% CI 0.58-0.84).
- Inconclusive
Randomised trial of cranberry-lingonberry juice and Lactobacillus GG drink for the prevention of urinary tract infections in women
Published 2001Reviewer Insight1/19/2026Bias was only partioally addressed
- The study recruited from "health centres for university students and hospital staff" - this is a relatively homogeneous population
- Baseline characteristics not detailed in the abstract, but the randomization process should have balanced groups
- No mention of controlling for confounding variables like sexual activity, hygiene practices, antibiotic use, or other dietary factors
- The open design (not blinded) introduces potential bias, though the objective outcome measure (bacterial culture) mitigates this
- Invalid
Consumption of a cranberry juice beverage lowered the number of clinical urinary tract infection episodes in women with a recent history of urinary tract infection
Published 2016Reviewer Insight1/19/2026Conflict of Interest:
- Two authors (Kevin C Maki and Arianne L Schild) have affiliations with Ocean Spray Cranberries, Inc.
- This represents a significant potential conflict of interest since the study manufacturer benefits directly from positive results
- Tested in Humans
Cranberry juice fails to prevent recurrent urinary tract infection: results from a randomized placebo-controlled trial
Published 2011Reviewer Insight1/19/2026What the study found:
The researchers gave some college women cranberry juice and gave others a fake drink that looked and tasted the same (placebo). They followed both groups for 6 months to see if cranberry juice would prevent urinary tract infections (UTIs).
The surprising result: Cranberry juice didn't work. In fact, women who drank the cranberry juice actually had more UTIs than women who drank the fake juice:
20% of women drinking cranberry juice got another UTI (31 out of 155) 14% of women drinking placebo got another UTI (23 out of 164) This is the opposite of what the researchers expected. The difference wasn't huge, but it clearly showed cranberry juice didn't help prevent infections.
Women in both groups also reported similar UTI symptoms at different time points, meaning cranberry juice didn't make symptoms better either.
Even when researchers looked at women who had the most UTIs in the past (the highest-risk group), cranberry juice still didn't help them.
- Awaiting Review
Consumption of cranberry as adjuvant therapy for urinary tract infections in susceptible populations: A systematic review and meta-analysis with trial sequential analysis.
Published 2021
Snapshot built: 2026-06-19