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Vaccinium macrocarpon (Cranberry Extract)
Well-researched extract that prevents UTI-causing bacteria from adhering to the urinary tract — best for prevention, not treatment.
What the evidence says
Cranberry Extract appears to help in 7 of 9 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 2007–2025 with a typical study size of 80 participants.
Based on 36 studies · 7 meta-analyses · 25 RCTs · 27,929 total participants
Confidence
HighWhat the studies found
By outcome
Cranberry Extract has an evidence score of 7.5/10 — strong evidence based on 36 indexed studies, including 4 meta-analyses. Well-researched extract that prevents UTI-causing bacteria from adhering to the urinary tract — best for prevention, not treatment.
The commonly studied dose of Cranberry Extract is 36mg PACs (proanthocyanidins) or 400-500mg extract standardized to PAC content. Research points to an estimated optimal dose around 54mg PACs, with a minimum effective dose near 36mg PACs. Individual response varies — start low and adjust.
The best time to take Cranberry Extract is in the morning. Taking it with food is preferred. Cranberry proanthocyanidins (PACs) prevent bacterial adhesion to uroepithelial cells via anti-adhesion activity against P-fimbriated E.
Olive Leaf Extract
Likely helpsOleuropein-rich extract with antiviral, antibacterial, and blood pressure-lowering effects — part of the Mediterranean diet's protective profile.
Eleuthero
Mostly mechanism / observationalAdaptogen that supports endurance, stress resilience, and immune function — distinct from true ginseng.
Last reviewed May 2026 · evidence from 36 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Cranberry extract contains proanthocyanidins (PACs) that prevent E. coli bacteria from adhering to the urinary tract lining. It's one of the most studied natural approaches to UTI prevention, though it works best for prevention rather than treatment of active infections. Often used alongside D-mannose for comprehensive urinary tract protection.
Prevents bacteria from sticking to bladder wall
How Cranberry Extract works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
36mg PACs (proanthocyanidins) or 400-500mg extract standardized to PAC content
Can be taken without food
| Form | Type |
|---|---|
| 💊Extract standardized to 36mg PACs (A-type) | Recommended |
| 💊Unsweetened cranberry juice | Alternative |
| 💊Dried cranberries | Alternative |
PAC content matters most — 36mg is minimum effective dose. Most juice/cocktails have too much sugar and too little PACs.
Minimum: 4 weeks
Optimal: weeks
Cycling: Not required
Note: Split dosing may maintain more consistent anti-adhesion activity in urine.
Based on multiple RCTs showing UTI reduction in women. Effect size varies significantly between studies (15-73% reduction). Most effective for recurrent UTI prevention. PAC-standardized extracts preferred over juice forms for consistent dosing and reduced GI effects.
Reduced frequency of UTIs
Generally considered safe
Use with caution — cranberry is high in oxalates
May increase INR/bleeding risk
May have additive effects
Tip: Take with food
Tip: Use extract instead of juice
Cranberry Extract is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are GI upset, diarrhea (with juice). Use caution if any of these apply to you: Kidney stones (high oxalate content).
Aged Garlic Extract
Likely helpsOdorless garlic extract with strong evidence for cardiovascular health, blood pressure, and immune support.
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