Unlike the live culture strains in For Those On Antibiotics, the strains in Every Day EXTRA have not been extensively tested alongside antibiotic medication. Therefore, Every Day EXTRA is most suitable when taken after finishing a course of antibiotics, as it contains strains including Lactobacillus acidophilus NCFM and Bifidobacterium lactis Bi-07, which have been scientifically trialled for use after a course of antibiotics(4).