Cranberry for Recurrent urinary-tract infection

Evidence grade B — Prevention

Assembled by the app from other entries in this library. It adds no evidence of its own — follow the links to the entries it draws on.

1 at grade B — 1 graded row

What is known

Each outcome with its grade (how strong the evidence is, A to D), the size of the effect where the entry records one, and how often studies agree.

Outcome	Grade	Effect size	Agreement
Recurrent urinary-tract infectionPrevention	Evidence grade B	Unclear	mixed

Read off the same rows as above. Nothing here is added that the entry does not itself record.

For recurrent urinary-tract infection, Cranberry earns evidence grade B (unclear effect, mixed consistency) — there is real evidence here. Prevention

Its A-type proanthocyanidins stop E. coli from adhering to the bladder wall, reducing colonization.

Products standardized to ~36 mg proanthocyanidins daily for prevention.

Safe; juice carries sugar; theoretical mild warfarin interaction at high intake.

A legitimate UTI-prevention tool (not a treatment) if you get recurrent infections. Dose by PAC content, not juice.

As the entry records it, from the studies it summarises. Not a recommendation for you — doses that suit a trial population may not suit you.

Entries that share this one's tags or conditions.

Cranberry for Active UTI treatmentEvidence grade D — Not a treatmentEvidence grade D
Cranberry for Recurrent UTI preventionEvidence grade B — In susceptible groupsEvidence grade B
D-Mannose for Recurrent urinary-tract infectionEvidence grade C — PreventionEvidence grade C
Cranberry: dosage and how to take it~36 mg proanthocyanidins/day.Evidence grade B

This entry lists no references of its own — it is assembled from the entries it links to, whose sources are on their pages.

Last revised Jul 10, 2026. A grade is this entry's reading of the evidence, not medical advice.