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Antibiotics & UTI

What is the Best Probiotic for UTI Prevention?

Andre Stone | MD

Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 25th, 2026.

Some studies have examined Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14 for preventing recurrent UTIs, but results are mixed and probiotics have not been shown conclusively to reduce recurrence. Any possible benefit may relate to effects on vaginal bacteria, but the mechanism and clinical benefit remain uncertain. Lactobacillus crispatus and some multi-strain products have also been studied, but it is not clear which strains, formulations, or doses—if any—reliably prevent UTIs. If you currently have UTI symptoms, seek evaluation from a qualified healthcare professional rather than relying on a probiotic to treat the infection. Prompt care is especially important for fever, back or side pain, vomiting, pregnancy, or worsening symptoms. If you need help evaluating UTI symptoms or discussing prevention options, telehealth services may offer access to a qualified healthcare professional.

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