Cranberry
Vaccinium macrocarpon
Cranberry is best known for helping reduce the recurrence of certain urinary tract infections by making it harder for some bacteria to stick to the urinary tract lining.
Primary Use
Reduced recurrence of UTIs
Common Forms
Capsule, Juice
Typical Dose
Standardized product providing about 36 mg PACs daily
Time to Effect
2-4 weeks
Overview
Cranberry has long been used as both a food and a health remedy, especially for urinary tract support. Native peoples and later herbal traditions used cranberry fruit for food, preservation, and wellness support. Today it is one of the most recognized natural products for recurrent urinary tract health.
Modern research does not support cranberry as a cure for active urinary tract infection, but it does support a more specific role in prevention, particularly for people prone to repeat uncomplicated UTIs. The best evidence centers on standardized cranberry products that provide meaningful amounts of proanthocyanidins, often abbreviated PACs.
How It Works
Cranberry contains A-type proanthocyanidins that may reduce the ability of certain bacteria, especially E. coli, to adhere to the lining of the urinary tract. If bacteria cannot attach as easily, they may be more likely to be flushed out in urine before causing problems.
This is different from killing bacteria directly. In simple terms, cranberry helps make the urinary tract a less sticky place for bacteria rather than acting like an antibiotic.
What It's Used For
Reduced recurrence of UTIs
Cranberry has moderate clinical support for reducing the risk of recurrent uncomplicated urinary tract infections in some populations. Benefits appear stronger with appropriately standardized products and consistent use.
Bladder health support
Regular cranberry use may support a healthier urinary environment, particularly in people prone to irritation or recurrence. It is supportive rather than curative.
Antioxidant support
Cranberries provide polyphenols and antioxidant compounds that may support broader health. This does not replace its more specific urinary role, but it is a meaningful secondary benefit.
Urinary tract wellness routine
Cranberry is often included in long-term urinary support plans for people with repeat episodes. Its value lies in prevention over time rather than instant symptom relief.
Dots indicate strength of research evidence (5 = strongest)
Disclaimer: This information is for educational purposes only and is not intended as medical advice. Always consult with a qualified healthcare provider before starting any new supplement, especially if you have a medical condition or take medications.
Last updated: March 2026