Home Ingredients Cranbey® (Cranberry Extract)
Kidney/Urinary TractWomen's HealthImmune Support

Cranbey® (Cranberry Extract)

Vaccinium macrocarpon
Evidence Level
Moderate
1 Clinical Trial
3 Documented Benefits
3/5 Evidence Score

Cranbey® is a cranberry (Vaccinium macrocarpon) concentrate providing the proanthocyanidins behind cranberry's urinary-tract benefits. It is used to support urinary and bladder health, especially in women.

Studied Dose Commonly around 500 mg of cranberry concentrate per day.
Active Compound Cranberry (Vaccinium macrocarpon) concentrate providing proanthocyanidins (PACs).

Benefits

Urinary tract health

Cranberry is widely studied for supporting urinary tract health and reducing recurrent urinary tract infections, recognized among non-antibiotic options.

Supported by Trial 1

Anti-adhesion action

Cranberry proanthocyanidins help stop certain bacteria from sticking to the bladder wall, the leading proposed mechanism.

Supported by Trial 1

Antioxidant support

Cranberry polyphenols provide antioxidant support beyond the urinary tract.

Supported by Trial 1

Mechanism of action

1

Type-A proanthocyanidins

Cranberry's distinctive type-A PACs interfere with the fimbriae E. coli use to adhere to the urinary lining, helping bacteria be flushed out.

2

Polyphenol antioxidants

Cranberry's broad polyphenols add antioxidant activity supporting overall health.

Clinical trials

1
Cranberry and Urinary Tract Health — Review
PubMed

Review of non-antibiotic interventions, including cranberry, to prevent recurrent urinary tract infections. (Santer et al. 2026, British Journal of General Practice)

Adults prone to recurrent UTIs.

The review supports cranberry among non-antibiotic options for reducing recurrent urinary tract infections.

Side effects and drug interactions

Common Potential side effects

Generally well-tolerated.
Mild digestive upset at high doses.
Very high intake may raise kidney-stone risk in susceptible people.

Important Drug interactions

Warfarin — cranberry may interact; monitor INR if combined.
Not a substitute for antibiotics during an active infection.
Tell your doctor about a history of kidney stones.

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Frequently asked questions about Cranbey® (Cranberry Extract)

What is Cranbey?

Cranbey® is a cranberry (Vaccinium macrocarpon) concentrate providing the proanthocyanidins behind cranberry's urinary-tract benefits. It is used to support urinary and bladder health, especially in women.

What is Cranbey used for?

Cranbey is researched primarily for Kidney/Urinary Tract, Women's Health, and Immune Support. Cranberry is widely studied for supporting urinary tract health and reducing recurrent urinary tract infections, recognized among non-antibiotic options.

What is the recommended dosage of Cranbey?

The clinically studied dose is Commonly around 500 mg of cranberry concentrate per day. Always follow the product label and check with a healthcare provider for personal advice.

Is Cranbey safe, and does it have side effects?

For most healthy adults, Cranbey is well tolerated at studied doses. Reported effects can include: Generally well-tolerated. Mild digestive upset at high doses. It may also interact with some medications. Cranbey is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Cranbey interact with any medications?

Possible interactions include: Warfarin — cranberry may interact; monitor INR if combined. Not a substitute for antibiotics during an active infection. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Cranbey?

NutraSmarts rates the evidence for Cranbey as Moderate (3 out of 5). It is backed by 1 clinical trial and 1 cited reference summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(1 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Santer M, Miller S, Fraser S, et al. Non-antibiotic interventions to prevent recurrent urinary tract infections. Br J Gen Pract. 2026;(advance)..PubMedUsed to support: Review supporting urinary-tract benefit of cranberry (the active in this branded cranberry).