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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Lactobacillus acidophilus L-92 and No Improvement in Allergy Symptoms

Research synthesisVery low evidenceModerate effect4 studies · 4 beneficial · 0 neutral · 0 harmful

Across 4 review studies, all 4 reported beneficial moderate-sized effects of Lactobacillus acidophilus L-92 on allergy symptoms, with 1 study finding a statistically significant improvement. The predominant effect size is moderate, though the evidence base is limited to reviews and lacks consistent reporting of doses, populations, or study durations.

Caveats: 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). Evidence base is small (only 4 studies) — conclusions should be considered preliminary. Many of the included studies did not reach statistical significance — effect may be smaller than the predominant direction suggests.

Generated Jun 11, 2026
4 of 4 papers
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