Does Cranberry Work for UTIs? It Lowers Repeat Infections in Some Groups, Not All
The latest Cochrane review finds cranberry products cut culture-confirmed UTIs in women with repeat infections, children and people after procedures, but not in care-home residents or pregnancy. It is not a substitute for antibiotics when an infection has started.
By Kymata Health Editorial Published Last checked
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Key takeaways
From 7 sources- Across 26 pooled trials with 6,211 people, cranberry products lowered the risk of symptomatic, culture-confirmed UTIs by about 30% (RR 0.70), with moderate-certainty evidence1.
- In women with recurrent UTIs the drop was smaller, about a quarter (RR 0.74, 8 trials, 1,555 women), and the confidence interval came close to no effect (0.55 to 0.99)1.
- There was little or no benefit in care-home residents, pregnant women or adults with bladder-emptying problems1; a year-long trial of capsules in nursing-home women found no difference at all4.
- The largest juice trial was funded by Ocean Spray, and two of its six authors were affiliated with the company23.
- Cranberry is for lowering the chance of the next infection, not for an infection you already have; NCCIH says to see a clinician for a suspected UTI7.
What this article covers
1 evidence profileThe evidence, graded
Pulled from the trial tables in our evidence profiles. Grades follow our evidence-grading policy.
Graded findings
4 rows- BGrade BSymptomatic, culture-confirmed UTIs (all groups)Improved Cranberry products lowered UTI risk vs placebo, water or no treatment (RR 0.70, 95% CI 0.58–0.84; moderate certainty), with substantial heterogeneity (I² 69%).Cranberry · Systematic review · n=6,211 · 2023 · PMID 37947276
- BGrade BUTIs in women with recurrent UTIsImproved Risk fell about a quarter (RR 0.74, 95% CI 0.55–0.99; I² 54%).Cranberry · Systematic review · n=1,555 · 2023 · PMID 37947276
- ∅No effectUTIs in care-home residents, pregnancy and bladder-emptying problemsNo effect Little or no difference: RR 0.93 in care-home residents, 1.06 in pregnancy and 0.97 with bladder-emptying problems.Cranberry · Systematic review · n=2,718 · 2023 · PMID 37947276
- ∅No effectBacteriuria plus pyuria in nursing-home residentsNo effect No difference vs placebo (29.1% vs 29.0%; OR 1.01). Symptomatic UTIs (10 vs 12 episodes), deaths and hospitalizations also did not differ.Cranberry · RCT · n=185 · 2016 · PMID 27787564
The short answer
Cranberry products probably reduce repeat UTIs in women who get them often, in children, and in people who are prone to infection after a medical procedure1. The 2023 Cochrane review, now covering 50 trials and 8,857 people, says the evidence does not support cranberry for older adults in care, pregnant women, or people with bladder-emptying problems1.
The effect is modest and the trials vary a lot (I² 69% in the main pooled result)1. NCCIH calls the effectiveness still in question because findings are inconsistent7.
What the Cochrane review found
In the main analysis, cranberry juice, tablets, capsules or powder lowered the risk of a symptomatic, culture-verified UTI compared with placebo, water or nothing (RR 0.70, 95% CI 0.58 to 0.84)1. The benefit was clearer after procedures (RR 0.47) and in children (RR 0.46) than in women with recurrent UTIs (RR 0.74)1.
Head-to-head with antibiotics, cranberry made little or no difference to culture-confirmed UTIs in 2 small trials (RR 1.03, 385 people)1. The review could not tell whether juice beats tablets or whether higher doses of the active proanthocyanidins (PACs) work better, because that evidence was very low certainty1. None of the six review authors disclosed relevant interests1.
The big juice trial, and who paid for it
In a 24-week trial, 373 women with a recent UTI drank one 240 mL serving of a cranberry beverage or a placebo drink each day2. There were 39 clinician-diagnosed UTI episodes on cranberry vs 67 on placebo (incidence rate ratio 0.61, 95% CI 0.41 to 0.91)2. But time to a culture-positive UTI did not differ (HR 0.97), which matters because culture is the firmer diagnosis2.
The trial was funded by Ocean Spray Cranberries, and two authors listed Ocean Spray as their affiliation23. That does not make the result wrong, but it is one reason to weigh the independent Cochrane pooling more heavily1. NCCIH notes the FDA lets juice labels mention only limited and inconsistent evidence for repeat UTIs in healthy women, and supplement labels limited evidence7.
Where cranberry did not help
In a Yale trial funded by the US National Institutes of Health, 185 women aged 65 or older in 21 nursing homes took two capsules a day with 72 mg of PACs in total, or placebo, for a year4. Bacteria plus white cells in the urine showed up equally often in both groups (29.1% vs 29.0%), and symptomatic UTIs did not differ (10 vs 12 episodes)4.
The Cochrane review likewise found little or no benefit in care-home residents (RR 0.93), pregnancy (RR 1.06) and neuromuscular bladder problems (RR 0.97)1.
Who should be careful
NCCIH says cranberry by mouth is generally thought to be safe, though very large amounts can upset the stomach and cause diarrhea, especially in young children7. In the Cochrane pooling, stomach side effects probably did not differ from placebo (RR 1.33, 95% CI 1.00 to 1.77)1. These groups need more care:
- Warfarin users: the evidence conflicts7. In a trial of 30 people on stable warfarin, 240 mL of cranberry juice a day for 2 weeks did not change warfarin blood levels, and INR differed on only one day5. NCCIH still advises checking with your clinician first7.
- People prone to kidney stones: in a metabolic study, 1 L of cranberry juice a day raised urinary calcium and oxalate and increased calcium oxalate saturation by 18%6.
- Anyone with UTI symptoms now: cranberry is not a replacement for diagnosis and antibiotics7.
- Pregnancy and breastfeeding: food amounts appear safe, but evidence for larger amounts is not conclusive, and pooled trials in pregnancy found no UTI benefit71.
- Older adults in care and people with bladder-emptying problems: the trials found little or no benefit14.
Quick answers
Common questions
4 answersCan cranberry juice get rid of a UTI?
No. NCCIH says cranberry is not recommended for an existing UTI in any population and that a suspected UTI needs a clinician7.
Is cranberry juice or a cranberry pill better?
The Cochrane review could not tell; the evidence comparing juice with tablets, and different PAC doses, was very low certainty1.
How much cranberry was used in trials?
Does cranberry help during pregnancy?
Three pooled trials with 765 pregnant women found little or no difference in UTIs (RR 1.06)1.
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References
7 sources. Numbers in the text link here.
Sources cited in this article
7 sources- 1Cranberries for preventing urinary tract infectionsCochrane Database Syst Rev, 2023 · PMID 37947276
- 2Consumption of a cranberry juice beverage lowered the number of clinical urinary tract infection episodes in women with a recent history of urinary tract infectionAm J Clin Nutr, 2016 · PMID 27251185
- 3Consumption of a cranberry juice beverage lowered the number of clinical urinary tract infection episodes (funding record: Ocean Spray Cranberries Inc.)Europe PMC, 2016
- 4Effect of Cranberry Capsules on Bacteriuria Plus Pyuria Among Older Women in Nursing Homes: A Randomized Clinical TrialJAMA, 2016 · PMID 27787564
- 5The absence of an interaction between warfarin and cranberry juice: a randomized, double-blind trialJ Clin Pharmacol, 2009 · PMID 19553405
- 6Effect of cranberry juice consumption on urinary stone risk factorsJ Urol, 2005 · PMID 16006907
- 7Cranberry: Usefulness and Safety (last updated November 2024)National Center for Complementary and Integrative Health (NCCIH), 2024
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