Research synthesisVery low evidenceModerate effect5 studies · 5 beneficial · 0 neutral · 0 harmful
Across 5 studies, all reported beneficial effects of *Lactobacillus rhamnosus* on reducing oxidative stress, with the predominant effect size being moderate. Two of the five studies reported statistically significant findings. The evidence is drawn primarily from animal and in vitro models (broiler chickens, mice, and cell lines), with no human clinical trials available.
- Studied populations: broiler chickens, mice, HaCaT cells (in vitro)
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 5 studies) — conclusions should be considered preliminary. All studies are non-human (animal or in vitro models), so relevance to human physiology is uncertain. The beneficial effects were often observed using exopolysaccharides (EPS) derived from *Lactobacillus rhamnosus* rather than the whole probiotic — outcomes may not generalize to standard probiotic supplementation.
Generated May 12, 2026