All 5 studies (all review articles) reported beneficial effects on immune function, with predominantly small effect sizes. No human clinical trials with statistically significant findings were identified. No specific dose range or population was consistently studied.
Caveats: Available evidence is overwhelmingly positive, but 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 statistically significant findings; the evidence base is comprised solely of review articles, not original human trials. Therefore, conclusions should be considered preliminary.
strengthen the immune system
another critical role of bacteriocins is their immunomodulatory effect
Lactobacilli comprise an important group of probiotics... [their components] mediate positive effect on the host, such as immunomodulatory... effects.
low- and moderate-intensity exercise has been shown to reduce physiological stress and improve immune function
stimulate/modulate of the immune system