NOW&ampreg; Probiotic Defense&amptrade; is a combination of &ampquot;friendly&ampquot; probiotic bacteria, including ones commonly found as soil organisms, blended into a fermented whole food base. NOW&ampreg; Probiotic Defense&amptrade; has 13 active bacterial strains and has been designed to support gastrointestinal health and immune system function. FOS is also included in this product to assist healthy growth of Acidophilus and Bifidus organisms.*