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Herb

Cranberry Extract

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Cranberry Extract. Vaccinium macrocarpon for UTI prevention.

How it works. Proanthocyanidins prevent E. coli adhesion.

What the research supports. 1 graded claims. Strongest: Reduces UTI recurrence (moderate).

How much to take. Typical dose: 500 mg standardized.

Side effects and interactions. 1 medication interaction listed. No serious side effects listed at normal doses.

Stacking. Pairs well with Vitamin D3 + K2, Zinc.

Common forms. Available as Standardized extract capsule, Liquid tincture (alcohol or glycerin), Powdered whole herb, Traditional decoction or tea.

Key studies. 8 studies cited. The strongest are listed with links to PubMed.

Community. Experiences from people who have tried Cranberry Extract. Anecdotes are not medical advice.

Cranberry Extract. Vaccinium macrocarpon for UTI prevention.

Key compound: procyanidin A2C30H24O12 · 576.5 g/mol

What it is

Vaccinium macrocarpon for UTI prevention.

Food sources

Whole dried plant material (root, leaf, flower, or aerial parts depending on the species)Standardized hydroethanolic or aqueous extract (capsule, tincture, or tea)Powdered traditional preparation used in Ayurvedic, TCM, or Western herbal practice

Goals

Immune FunctionWomen's Health

How it works

Proanthocyanidins prevent E. coli adhesion.

Pathways

  • Proanthocyanidins prevent E
  • coli adhesion

Effects

  • ↓UTI recurrence decreases

What the research supports

Reduces UTI recurrencemoderate

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Typical dose
500 mg standardized
TimingConsistent daily timing recommended; split larger doses if GI tolerance is a concern.
With foodEither with or without food.
Best formMost evidence is based on the standardized extract capsule form.
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Side effects & interactions

Common side effects

  • GI upset

Medication interactions

Prescription medications (general)minor

Always disclose Cranberry Extract use to your prescriber — additive, antagonistic, or pharmacokinetic interactions are possible.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • Vitamin D3 + K2Foundational immune modulation.
  • ZincRequired cofactor for innate and adaptive immune function.

Common forms

  • Standardized extract capsule
  • Liquid tincture (alcohol or glycerin)
  • Powdered whole herb
  • Traditional decoction or tea

Key studies

8 studies cited in total.

Cranberry for UTI prevention ↗
Meta-analysis · Cochrane · 2012

Reduced UTI risk in women.

PubMed: Cranberry Extract — Reduces UTI recurrence ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Cranberry Extract and "Reduces UTI recurrence". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Cranberry Extract — randomized controlled trial ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Cranberry Extract and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

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