The present invention relates to a composition comprising at least one probiotic bacterial strain belonging to the species Lactobacillus reuteri as a vitamin B12 producer. In particular, the present invention relates to selected bacterial strains belonging to the species Lactobacillus reuteri as vitamin B12 producers. Finally, the present invention relates to a food composition or supplement or pharmaceutical composition comprising a bacterial strain belonging to the species Lactobacillus reuteri.
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