Cranberry Antioxidants: UTI Prevention & Cardiovascular Benefits

Cranberries contain unique A-type proanthocyanidins (PACs) and other polyphenols with documented anti-adhesion and anti-inflammatory properties.

Urinary Tract Infection Prevention

• Mechanism: A-type PACs inhibit E. coli P-fimbriae binding to urothelial cells — prevents colonization.
• Evidence: Meta-analyses show 26–35% reduction in recurrent UTI in women; less clear for elderly, catheterized, pediatric.
• Form matters: Juice cocktail (high sugar) vs. PAC-standardized extract (36 mg PAC/day effective dose).
• Not treatment: Does not eradicate established infection — antibiotics required.

Cardiovascular Effects

• Lipids: Modest LDL reduction, HDL increase in some trials.
• Inflammation: ↓ CRP, IL-6, oxidative stress markers.
• Endothelial function: Improved flow-mediated dilation.
• Blood pressure: Small reductions in systolic BP (2–3 mmHg).
• Platelet inhibition: Reduced aggregation (similar to low-dose aspirin mechanism).

Practical Recommendations

• Choose PAC-standardized supplements (36 mg/day) or unsweetened concentrate.
• Juice: 8–16 oz/day of 27% juice (high sugar — account in diet).
• Caution: Warfarin interaction (case reports of INR elevation); oxalate content (kidney stone risk).
• Not a substitute for antibiotics, hydration, or urologic evaluation for recurrent UTI.