Probiotic Blend in a Whole Food Base Healthy Intestinal Flora 1 Billion Organisms Promotes Positive Probiotic Balance Supports Healthy Immune System Non-GMO A Dietary Supplement Probiotics/Enzymes/Digestive Family Owned Since 1968 GMP Quality Assured NOW Probiotic Defense is a combination of "friendly" probiotic bacteria, including clinically validated strains, blended into a fermented whole food base. NOW Probiotic Defense combines 13 active bacterial strains formulated to support gastrointestinal health and immune system function. FOS (fructo-oligosaccharide) is also included in this product to assist healthy growth of Acidophilus and Bifidus organisms.