Sigma O is an OMRI approved, concentrated blend of ADVANTA MOS, live, active yeast, and microbes/enzymes for use on organic operations. MOS and Beta Glucans bind pathogenic microbes in the gut, feed the good microbes in the intestines, and stimulate/regulate the immune system of the animal, while live yeast, microbes, and enzymes aid in digestion and replenish rumen and intestinal microbes.