How much cranberry juice should you drink for UTIs?

The trials varied, broadly in the range of around 200 to 500 mL of cranberry juice a day. Choose unsweetened or low-sugar juice — sweetened versions add a lot of sugar for little extra benefit — and note that the active compounds (proanthocyanidins) are what matter, so products differ in strength.

Can cranberry treat a UTI you already have?

No. The evidence is for prevention — reducing how often UTIs come back in women prone to them — not for treating an active infection. A current UTI needs proper medical assessment, and often antibiotics, so see a clinician rather than relying on cranberry.

Home · The Evidence Index · Perimenopause · Urinary health

Does cranberry prevent recurrent UTIs?

Q: Does cranberry prevent recurrent UTIs?

Yes, in women who are prone to them. A 2023 Cochrane review of 50 studies (8,857 people) found that in women with recurrent urinary-tract infections, cranberry products reduced the risk of another symptomatic, culture-confirmed UTI by about a quarter (relative risk 0.74). The benefit was clear in this group but not in older adults in care, people with bladder-emptying problems, or during pregnancy — and it prevents infections rather than treating one you already have.

Verdict — Strong (women with recurrent UTIs)

Reviewed against the AntiAgingGreens evidence standard · Cochrane review, 50 studies, 8,857 people · Last reviewed July 2026

Yes — in women who get recurrent urinary-tract infections, cranberry reduced the risk of another UTI by about a quarter. Two things to hold onto: this is prevention, not a treatment for an infection you already have, and the benefit is specific to women prone to them.

You drink

Unsweetened cranberry juice, ~200–500 mL/day

The compounds

Proanthocyanidins (PACs) from the fruit

In the bladder

Make it harder for E. coli to stick to the bladder wall

Result

Fewer recurrences — about a quarter lower risk

The point of action is prevention: cranberry makes it harder for the bacteria to gain a foothold, which lowers how often infections come back. It does nothing to clear an infection already established.

What the evidence supports

✓ ~26% fewer recurrent UTIs in women prone to them (relative risk 0.74)¹
✓ Cochrane-level evidence — 50 studies, 8,857 people
✓ A plausible mechanism — PACs block bacterial adhesion

What it doesn't do

✗ Treat an active UTI — this is prevention only
✗ Help everyone — no benefit shown in the elderly, bladder-emptying problems, or pregnancy
✗ Work as sugary "cranberry drink" — the PAC content is what counts

Where this comes from

Not supported Emerging Moderate Strong

Why it works: Most urinary infections start when E. coli from the gut cling to the lining of the bladder and multiply. Cranberries contain proanthocyanidins — a particular type of plant compound — that interfere with the tiny hooks the bacteria use to attach. If the bacteria cannot get a grip, they are flushed out before an infection takes hold. That is a prevention mechanism, which is exactly why cranberry lowers recurrences but does nothing for an infection already underway.
What the human evidence shows: The anchor is a 2023 Cochrane review — the highest tier of evidence synthesis — pooling 50 studies and 8,857 participants.¹ In women with recurrent UTIs, cranberry products reduced symptomatic, culture-confirmed infections, with a relative risk of 0.74 — about a quarter fewer. The review found a benefit in children too, but specifically not in older adults in residential care, in people with bladder-emptying problems, or in pregnancy — so the effect is real but population-specific.
Where the evidence stops: The clear benefit is in women prone to recurrent infections; don't read it as protection for everyone or as a treatment. The size of the effect is moderate — roughly a quarter fewer episodes, not elimination. And it depends on getting enough of the active compounds, so an unsweetened, genuinely cranberry product matters more than a sugary "cranberry-flavoured" drink.

If you think you have a UTI now: this page is about prevention. A current infection — burning, urgency, or worse, fever and back pain — needs proper assessment and often antibiotics, so see a clinician rather than reaching for juice. We sell nothing and recommend no supplement or brand; where cranberry helps, it helps as an ordinary food.

At a glance

Claim assessedCranberry prevents recurrent UTIs

VerdictStrong in women with recurrent UTIs — ~26% fewer (RR 0.74); prevention, not treatment

Food & doseUnsweetened cranberry juice, ~200–500 mL/day (trials varied; PAC content matters)

Who it helpsWomen prone to recurrent UTIs; not shown in elderly care, bladder-emptying problems, or pregnancy

Evidence typeCochrane systematic review of 50 RCTs (8,857 participants)

Last reviewedJuly 2026

Sources

Cranberries for preventing urinary tract infections. Cochrane Database of Systematic Reviews, 2023. cochranelibrary.com

Bottom line for you

If you're a woman who gets UTIs again and again, a daily unsweetened cranberry juice is a reasonable, well-evidenced habit — the best synthesis we have found it cuts recurrences by around a quarter. Choose a real, low-sugar cranberry product, since the active compounds are what do the work.

Keep the limits in mind: it's prevention, not a cure, the benefit is specific to women prone to infections, and it does not replace medical care for an infection you already have. A sensible add-on for the right person — not a treatment, and not for everyone.

Educational information based on peer-reviewed human studies. Not medical advice — a suspected urinary-tract infection needs medical assessment. AntiAgingGreens never sells or recommends supplements. We report what the evidence shows — and where it stops.