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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Bifidobacterium animalis subsp. lactis BB-12 and Improved Immune Function

Research synthesisVery low evidenceMixed effect size4 studies · 4 beneficial · 0 neutral · 0 harmful

Across 4 studies, all reported beneficial effects on immune function, with effect sizes ranging from small to large. The highest-quality evidence (a review with evidence score 3) indicated large effects on resistance to respiratory infections. The evidence base is small and consists entirely of review articles, with limited reporting on specific doses, study durations, and populations.

Caveats: Evidence base is small (only 4 studies) — conclusions should be considered preliminary. Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). None of the included studies reported statistical significance, and all are review articles rather than primary clinical trials — effect may be smaller than the predominant direction suggests.

Generated May 12, 2026
4 of 4 papers
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