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Cranberry: For Urinary Tract Health

Cranberry: Naturally Effective for Urinary Tract Health

Did you know for centuries, Native Americans used cranberry (Vaccinium macrocarpon) as a conventional treatment for bladder and kidney ailments? Today, modern science validates their ability to support urinary tract health1 and confirms cranberries are an outstanding source of antioxidants.

How Do Cranberries Help Urinary Tract Health?

Cranberries have been clinically shown to support urinary tract health by helping to reduce urinary tract wall adhesion of bacteria, like E. coli and Proteus mirabilis, that can cause urinary tract infections (UTIs) and discomfort. The primary mechanism by which cranberries are beneficial in UTIs is due to compounds in cranberries called A-type proanthocyanidins (PACs), which are powerful flavonoid antioxidants that reduce bacterial adhesion.2

Doctor’s Best Cranberry with Cranberex™ is one of the most concentrated cranberry extracts available. In fact, tests at Rutgers University comparing PAC levels in Cranberex™ with five leading cranberry product brands showed Cranberex™ has a far greater potency than any other brand tested.3

Where is the Best Place to Source Cranberries?

Geography also plays an important role in a cranberry’s quality. While about 85% of domestic cranberries are grown in the Northeastern U.S., the most potent cranberries are grown in the Pacific Northwest. The unique coastal climate provides the best growing environment for cranberries. Cranberex™ is sourced from cranberries only grown in Oregon since cranberries in that region have higher levels of PACs than most other cranberries.

Cranberry Take-Away

Doctor’s Best Cranberry with Cranberex™ is naturally effective for urinary tract health. Since cranberry’s bacterial anti-adhesion mechanism does not kill bacteria, there is less

chance of resistant bacterial strains. This has been considered an advantage compared to antibiotic treatment for UTI’s and has been shown more effective in reducing chronic UTI reoccurrence.4,5,6

If you want potent, natural urinary tract support that is vegan, non-GMO, gluten-free and soy-free, Doctor’s Best Cranberry with Cranberex™ is an excellent choice.


  1. Hisano M, Bruschini H, Nicodemo AC et al. Cranberries and lower urinary tract infection prevention. Clinics. 2012;67: 661-667.
  2. Blumberg JB et al. Cranberries and their bioactive constituents in human health. Adv Nutr. 2013;4: 618-632.
  3. Ethical Naturals builds science for Oregon cranberry extracts, 2017, 
  4. Howell,, A-type cranberry proanthocyanidins and uropathogenic bacterial anti-adhesion activity. Phytochemistry. 2005 Sep;66(18):2281-91. 
  5. Foo Y,, A-Type proanthocyanidin trimers from cranberry that inhibit adherence of uropathogenic P-fimbriated Escherichia coli. J Nat Prod. 2000 Sep;63(9):1225-8. 
  6. Beerepoot MA et al. Nonantibiotic prophylaxis for recurrent urinary tract infections: A systematic review and meta-analysis of randomized controlled trials. J Urology. 2013;190: 1981-1989.

Karsten Mueller MS, PhD Bio
Mission: I Cause Vibrant Health for People and the Planet

Karsten has a lifelong love for the health of people and the planet. He studied biology, economics and policy during his doctoral studies at the University of California, Santa Cruz. And, called “The Healthiest Guy in Town” by the Santa Cruz Weekly, he graduated summa laude with a Master’s of Science in Holistic Nutrition from Hawthorn University. 

Karsten provides Nutrition and Health Counseling in Santa Cruz, California. He also enjoys beach volleyball, soccer, biking and martial arts. Karsten has taught Environmental Science and Environmental Studies courses at UCSC, SJSU and CSUMB. Karsten is currently co-creating a Forum: Pathways Toward Responsible Aquaculture in California, to be held at Moss Landing Marine Labs August 10-11, 2018.