Cranberry
Also known as: Vaccinium macrocarpon, Cranberry extract, PACs
Cranberry is commonly used in urinary-tract-wellness routines. Some research suggests cranberry products may reduce the risk of recurrent UTIs in some women, likely via proanthocyanidins that make it harder for bacteria to stick to the bladder wall, but findings are inconsistent and processing can strip the relevant compounds. Cranberry is not a treatment for an existing infection — symptoms of a UTI need medical attention.
Snapshot
What this page can tell you: NCCIH's framing of cranberry for recurrent UTIs (inconsistent) and that it's not a treatment for an active infection.
What it cannot: That cranberry treats a UTI — symptoms of a UTI need medical care. Informational only.
🧩 Stack insights — how this fits into a schedule
Recurrent-UTI context — NCCIH: cranberry products may reduce the risk of recurrent UTIs in some women, but findings are inconsistent, and cranberry is not a treatment for an existing infection. Capsule processing can reduce the relevant compounds.
Evidence about a cranberry-warfarin interaction is conflicting — ask if you take warfarin.
Relationship insights are informational only — they describe what is commonly discussed or studied, not what you should take. Not medical advice; review your routine with a clinician or pharmacist.
🕒 Timing
When: With a meal, Anytime
Food: With or without food
Timing is flexible; consistency matters more than clock time.
💊 Common use range
Varies by product (juice, capsules, PAC-standardized extracts)
No established upper limit; very large amounts can cause stomach upset or diarrhea.
Ranges are informational, not a recommended dose. Talk to a professional about what is right for you.
🤔 Worth considering?
Evidence vs. effort: Mixed evidence relative to burden
Low-burden and generally well tolerated; the recurrent-UTI evidence is suggestive but inconsistent, and capsule processing can reduce the proanthocyanidins thought to matter. Anyone on warfarin should ask about it first, and an actual UTI needs medical care, not cranberry.
A general summary, not a recommendation. Whether something fits your situation is worth discussing with a healthcare professional.
⚠️ Commonly noted interactions (supplements)
None listed.
Often about absorption or timing rather than danger — separating doses is common. This list is not exhaustive.
🧭 Caution level
Ask a clinician or pharmacist before use.
- Anticoagulant (blood thinner) interaction
Caution level is an informational summary of commonly discussed caution categories and doses — not a safety rating, approval, or medical advice. Low caution does not mean safe for you.
🩺 Medication caution categories
- Blood thinners (anticoagulants)
🏥 Surgery & procedure caution
Not a well-established surgical concern; share your full supplement list with your care team.
If you have a procedure scheduled, bring your full supplement list to your surgical and anesthesia team. Do not stop prescribed medication unless your clinician tells you to. Do not start or stop supplements based only on this app.
✅ Quality checklist
- Prefer products with third-party testing or a certificate of analysis (COA).
- Check the label for the exact form and the elemental or active amount per serving.
🧩 Commonly paired with
🔁 Alternatives
None listed.
🗣️ Questions for a professional
- I get recurrent UTIs — is a cranberry product worth trying in my case, and does it fit with my medications?
🛡️ Safety notes (source-reviewed)
- Generally well tolerated; very large amounts can cause stomach upset or diarrhea.
- Evidence about a cranberry-warfarin interaction is conflicting — ask if you take warfarin.
⚖️ Evidence limitations
- NCCIH: recurrent-UTI evidence is inconsistent, and capsule processing can reduce the relevant proanthocyanidins.
❓ Frequently asked
Does cranberry cure a UTI?
No. NCCIH notes cranberry is not a treatment for an existing UTI — see a clinician for symptoms. It may reduce the risk of recurrent UTIs in some women, but findings are inconsistent.
🔬 Evidence snapshot
Cranberry products may decrease the risk of recurrent symptomatic UTIs in some women, but findings are inconsistent, and cranberry is not a treatment for an existing infection. Evidence for other uses is scant.
🧪 Forms & quality
Needs evidence review — no source-reviewed information yet. We only show dose and monitoring details after they have been checked against reputable sources.
See the supplement glossary for what form names like "L-", chelated, or standardized extract mean.
📏 Dose & monitoring
Evidence vs. burden: Mixed evidence relative to burden
😐 Commonly reported side effects
- Stomach upset or diarrhea with very large amounts
Non-exhaustive and individual.
🔄 Cycling & breaks
No established cycling pattern.
📅 Daily use notes
Evidence about a cranberry–warfarin interaction is conflicting — if you take warfarin, ask a professional before regular use. See a clinician for actual UTI symptoms instead of self-treating.
📋 Source review status
Source-reviewed — last reviewed 2026-07-03
Reviewed against the NCCIH cranberry page; editorial pass still pending.
Research backlog (queries to verify):
- cranberry proanthocyanidins recurrent UTI meta-analysis
- cranberry warfarin interaction evidence
📚 References
- NCCIH — CranberryNCCIH — Verified inconsistent recurrent-UTI evidence (possible ~25%+ risk reduction in women), PAC mechanism and processing caveat, not-a-treatment framing, GI effects at large amounts, and conflicting warfarin-interaction evidence.
Verified against the source shown. See the research-status page for how review works.
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