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Support your childs immune system with BioGaia Pharax Kids probiotic drops with vitamin D for the throat.* BioGaia Pharax Kids is a probiotic food supplement for children with live bacteria that have been tested in clinical studies. Our specially formulated drops contain a unique blend of two patented probiotic bacteria strains L. reuteri DSM 17938, L. reuteri ATCC PTA 5289 and vitamin D.