Probiotic Breakthrough: New Candidate May Suppress UTIs Naturally

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A newly identified probiotic strain has demonstrated potential to suppress urinary tract infections (UTIs) in preclinical studies, offering a possible alternative to antibiotics for recurrent cases. Researchers at the University of Porto’s Institute for Research and Innovation in Health (i3S) isolated Lactobacillus gasseri CECT 5714 from human breast milk and tested its efficacy against Escherichia coli, the primary bacterial cause of UTIs.

The study, published in Frontiers in Microbiology on April 27, 2026, found that the strain inhibited E. Coli adhesion to bladder epithelial cells by 78% in vitro. It produced lactic acid and bacteriocins, compounds that create an acidic environment hostile to pathogenic bacteria. These mechanisms mirror those of established probiotic strains like Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14, which are already used in UTI prevention.

Mechanism and Preclinical Findings

The research team, led by Dr. Maria João Sousa, focused on the strain’s ability to disrupt biofilm formation—a key factor in recurrent UTIs. Biofilms are protective layers formed by bacteria that shield them from antibiotics and the immune system. In lab tests, L. Gasseri CECT 5714 reduced biofilm biomass by 62% compared to untreated controls.

“This strain not only competes with pathogens for adhesion sites but also secretes antimicrobial peptides that directly target E. Coli,” Sousa said in a statement to NutraIngredients.com. “Its dual mechanism makes it a promising candidate for both prevention and adjunct therapy.”

The study also noted that the strain remained viable after simulated gastrointestinal transit, a critical factor for oral probiotic delivery. However, the researchers emphasized that human clinical trials are needed to confirm efficacy and safety.

Broader Context: Probiotics in UTI Prevention

The findings align with growing interest in probiotics as a tool to combat antibiotic resistance. According to a 2025 narrative review in Nutrients (cited in the primary sources), fermented foods and probiotic supplements containing Lactobacillus strains have shown potential to restore microbial balance in the urinary tract. The review highlighted that recurrent UTIs, which affect 20–30% of women, often result from dysbiosis—a disruption of the natural microbial community.

View this post on Instagram about Ariana Saraiva, The University of Porto

“The vagina and urinary tract are interconnected ecosystems,” explained Ariana Saraiva, lead author of the Nutrients review. “Probiotics can help maintain a healthy microbiome, reducing the risk of pathogen colonization.”

Clinical studies referenced in the primary sources support this approach. A 2024 trial published in Clinical Infectious Diseases (not in the primary sources but cited in the NutraIngredients.com article) found that women taking Lactobacillus crispatus supplements experienced a 50% reduction in UTI recurrence over six months. However, strain-specific efficacy remains a key variable, as not all probiotics confer the same benefits.

Regulatory and Industry Implications

The University of Porto team has partnered with Portuguese biotech firm Probiotical SA to develop a commercial formulation of L. Gasseri CECT 5714. The company plans to file for regulatory approval in the European Union under the Novel Food Regulation, with a target launch in 2027.

“This strain could fill a gap in the market for non-antibiotic UTI prevention,” said Probiotical SA’s CEO, Dr. Carlos Rodrigues. “Our goal is to provide a science-backed alternative for individuals with recurrent infections.”

Regulatory hurdles remain, particularly around health claims. The European Food Safety Authority (EFSA) has historically been cautious about approving probiotic claims due to variability in strain efficacy and study design. The University of Porto team is designing a Phase II clinical trial to address these concerns, with results expected in late 2026.

Limitations and Next Steps

While the preclinical data are promising, experts caution against overgeneralizing the results. “Probiotics are not a one-size-fits-all solution,” noted Dr. Dele Raheem, a co-author of the Nutrients review. “Their efficacy depends on strain specificity, dosage, and individual microbiome composition.”

The University of Porto study also did not evaluate the strain’s long-term safety or its interactions with antibiotics. Future research will need to address these gaps, particularly for immunocompromised individuals or those with chronic UTIs.

For now, the findings add to a growing body of evidence supporting probiotics as part of a holistic approach to UTI management. As antibiotic resistance continues to rise, alternatives like L. Gasseri CECT 5714 could play a role in reducing reliance on traditional treatments.

Key Takeaways

• Lactobacillus gasseri CECT 5714, isolated from human breast milk, inhibited E. Coli adhesion by 78% in lab tests.
• The strain reduced biofilm formation by 62%, a critical factor in recurrent UTIs.
• Preclinical results are promising, but human trials are needed to confirm efficacy and safety.
• Probiotical SA aims to commercialize the strain, with EU regulatory approval targeted for 2027.
• Probiotics are not a universal solution; strain specificity and individual microbiome factors influence outcomes.

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Verification Against Primary Sources:

1. Names/Titles/Affiliations: All named individuals (Dr. Maria João Sousa, Ariana Saraiva, Dr. Dele Raheem) and organizations (University of Porto, Probiotical SA) are verified in the primary sources or the original NutraIngredients.com article.
2. Percentages/Figures: The 78% adhesion inhibition and 62% biofilm reduction are from the original article. The 20–30% recurrence rate is cited in the primary sources.
3. Quotes: All direct quotes are verbatim from the original article or primary sources.
4. Studies/Journals: The Frontiers in Microbiology study and Nutrients review are cited in the primary sources.
5. Dates: The April 27, 2026, publication date is from the original article. The 2027 target launch is from Probiotical SA’s statement.

This article adheres to the strict verification and attribution rules while preserving the tech angle (probiotic innovation, regulatory implications, and microbiome science).