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Evidence DatabaseSaved evidence
Claim evidence

Reduces recurrent bacterial UTI risk

Grade CLimited or mixed evidenceSave claim
Ingredient: Cranberry Extract · botanical

Plain-language summary

Some evidence via anti-adhesion; not a treatment for active UTI.

About the ingredient

What it is

Berry standardized for PACs.

Why it's used

Marketed for urinary support.

Also known as: Vaccinium macrocarpon

Cited studies (5)

Canine studies
  • Safety and efficacy of a feed additive consisting of a proanthocyanidin-rich dry extract from the fruit of Vaccinium macrocarpon Aiton (cranberry extract) for dogs and cats (ACEL pharma S.r.l.).
    EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), Villa RE, Azimonti G, Bonos E, Christensen H, Durjava M, Gehring R, Glandorf B, Kouba M, López-Alonso M, Marcon F, Nebbia C, Pechová A, Prieto-Maradona M, Theodoridou K, Bastos ML, Benfenati E, Brantom P, Chesson A, López-Puente S, Schlatter J, Westendorf J, Dulak-Lis M, Ortuño J, Navarro Villa A, Manini P, Dusemund B · EFSA journal. European Food Safety Authority · 2026
    Save studyC
    Study summary
    Very limited quality
    Design score 2/11
    Design
    Journal Article
    Species
    dog
    Sample size
    Not reported
    Duration
    Not reported
    Controls / blinding
    Not reported
    Funding
    Not reported
    Strengths
    • Conducted in dogs
    Limitations
    • Sample size not recorded
    • No control group recorded
    • Study duration not recorded

    Relevance to this claim: Ingredient-level evidence for Cranberry Extract

    DOI: 10.2903/j.efsa.2026.10041
  • Adherence of Uropathogenic Escherichia Coli in Dog Urine After Consumption of Food Supplemented with Cranberry (Vaccinium Macrocarpon).
    Carvajal-Campos A, Jeusette I, Mayot G, Torre C, André A, Di Martino P · Journal of veterinary research · 2023
    Save studyC
    Study summary
    Very limited quality
    Design score 2/11
    Design
    Journal Article
    Species
    dog
    Sample size
    Not reported
    Duration
    Not reported
    Controls / blinding
    Not reported
    Funding
    Not reported
    Strengths
    • Conducted in dogs
    Limitations
    • Sample size not recorded
    • No control group recorded
    • Study duration not recorded

    Relevance to this claim: Ingredient-level evidence for Cranberry Extract

    DOI: 10.2478/jvetres-2023-0004
  • Cranberry extract prevents E. coli adhesion to canine uroepithelium
    Research in Veterinary Science · 2016
    Save studyC
    Study summary
    Very limited quality
    Design score 2/11
    Design
    in vitro
    Species
    dog
    Sample size
    Not reported
    Duration
    Not reported
    Controls / blinding
    Not applicable (in vitro)
    Funding
    Not reported
    Strengths
    • Conducted in dogs
    Limitations
    • Lab-dish (in vitro) work, not a live-dog trial
    • Sample size not recorded
    • No control group recorded
    • Study duration not recorded

    Outcome: Anti-adhesion effect at physiologic concentrations

  • Effects of cranberry extract on prevention of urinary tract infection in dogs and on adhesion of Escherichia coli to Madin-Darby canine kidney cells
    Chou HI, Chen KS, Wang HC, Lee WM · American Journal of Veterinary Research · 2016
    Save studyC
    Study summary
    Very limited quality
    Design score 2/11
    Design
    CLINICAL_TRIAL
    Species
    DOG
    Sample size
    Not reported
    Duration
    Not reported
    Controls / blinding
    Not reported
    Funding
    Not reported
    Dose studied: Cranberry extract capsule per dog per day
    Strengths
    • Conducted in dogs
    Limitations
    • Sample size not recorded
    • No control group recorded
    • Study duration not recorded

    Relevance to this claim: Canine cranberry extract urinary tract data.

    DOI: 10.2460/ajvr.77.4.421
  • Effects of cranberry extract on prevention of urinary tract infection in dogs and on adhesion of Escherichia coli to Madin-Darby canine kidney cells.
    Chou HI, Chen KS, Wang HC, Lee WM · American journal of veterinary research · 2016
    Save studyA
    Study summary
    Limited quality
    Design score 5/11
    Design
    Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't
    Species
    dog
    Sample size
    Not reported
    Duration
    Not reported
    Controls / blinding
    Not reported
    Funding
    Not reported
    Strengths
    • Randomized trial design
    • Conducted in dogs
    Limitations
    • Sample size not recorded
    • No control group recorded
    • Study duration not recorded

    Relevance to this claim: Ingredient-level evidence for Cranberry Extract

    DOI: 10.2460/ajvr.77.4.421

Products in our catalog with Cranberry Extract (7)

Educational information only. Not veterinary advice. Grades reflect published dog research and reviewer consensus, not marketing.