Lactobacillus paracasei supernatant in the presence and absence of rice bran extract reduces S. Typhimurium growth in a dose‐dependent manner. The dose‐dependent effects of (a) LP and (b) LP+RBE on S. Typhimurium growth were evaluated. Optical density at a wavelength of 600 nm was plotted on the y‐axis and time on the x‐axis. Each point represents the mean of four independent experiments and error bars indicate standard error. □ indicates negative control, ○ indicates vehicle control or vehicle control+RBE, ▵ indicates 20% LP or LP+RBE, ◊ indicates 40% LP or LP+RBE, X indicates 60% LP or LP+RBE, ▽ indicates 80% LP or LP+RBE, and ▯ indicates 100% LP or LP+RBE. Statistical significance between all treatments compared to the vehicle control occurred at (a) 5·0 h in LP and (b) 3·7 h in LP+RBE where *P < 0·05, **P < 0·01, ***P < 0·001 and ****P < 0·0001. In (a) and (b), results represent four independent experiments. [Colour figure can be viewed at wileyonlinelibrary.com]