Among the most numerous beneficial bacteria in the mouth, Streptococcus salivarius is typically the first one acquired in infancy. BLIS K12 is a powerful strain of S. salivarius that, when taken regularly, colonizes the mouth and throat and helps to maintain the natural defense system of the main entry point of the body. BLIS K12 has been clinically shown to support the maintenance of mouth, ear, nose, and throat health.  This product is formulated with 2 Billion CFU at time of manufacture