NOW OralBiotic contains the naturally occurring probiotic organism Streptococcus salivarius BLIS K12, which has been clinically shown to support oral and throat health. Â Although it is not an antibiotic, OralBiotic BLIS K12 successfully colonizes the oral cavity at the expense of other bacteria, promoting oral health. Â It also helps to improve breath when used in conjunction with proper oral hygiene. Â Fructooligosaccharides (FOS) provide nutritional support for S. salivarius.*