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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Big effect

A probiotic-vitamin D combo slashed a gut leakiness marker by nearly 20 ng/mL in IBS patients — but only in those without constipation, and overall symptoms didn't budge

This small trial suggests a specific multistrain probiotic with vitamin D may help repair gut barrier function in a narrow group of IBS patients, but the lack of symptom improvement and the novelty of the pairing mean it's far from a settled treatment.

Zonulin is a protein that controls gut lining permeability; high levels signal a 'leaky gut'. Over 12 to 16 weeks, the active group saw zonulin drop by 19.5 ng/mL, a sign of improved barrier function. Yet the benefit was limited to IBS without constipation, and key measures like pain and quality of life showed no significant change, while the study's small size and unique probiotic-plus-vitamin-D mix call for cautious interpretation.

Where this fits in the evidence

This is among the first studies we've indexed on Bifidobacterium lactis BA05 for Improved Gut Barrier Function — treat it as an early signal until more research accumulates.

The study

Multistrain Probiotics Plus Vitamin D Improve Gut Barrier Function and Gut Microbiota Composition in Irritable Bowel Syndrome Without Constipation: Results from a Double-Blind, Randomized, Placebo-Controlled Trial.

  • Randomized Controlled Trial (RCT)
  • n = 35
  • 2025-05-18
  • Nutrients
More on Bifidobacterium lactis BA05More on Improved Gut Barrier Function

This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.

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