The effect of Saccharomyces cerevisiae on the immune system and the occurrence of cold and flu episodes is a current research problem. In our study, we focused on the issue of better resistance to colds and flu in otherwise healthy children who regularly consume baker's yeast syrup with vitamin C. At the same time, we investigated the effect of vitamin C yeast preparation on the increase of excretory immunoglobulin A (S-IgA) in saliva of the children. Higher S-IgA levels have been associated in previous studies with a lower incidence of cold and flu episodes. A placebo-controlled double-blind study of syrup with yeast and vitamin C was performed, and only vitamin C was administered to the control group as placebo. The results of the study did not show the effect of yeast and vitamin C syrup on the occurrence of cold and flu episodes. Also, the yeast preparation did not affect the increase in excretory immunoglobulin A in saliva. Our study did not show a positive effect of Saccharomyces cerevisiae on children’s resistance to colds.
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