Dietary Supplement Super Strength Proprietary Blen Designed to Maintain Healthy Intestinal Flora Guaranteed Quality - Laboratory Tested A proprietary blend of the most beneficial known strain of Lactobacillus Acidophilus, synergistically combined with three other genetically distinct probiotic organisms and the prebiotic Fructooligosaccharide (FOS), is designed to aid in the maintenance of probiotic activity in the intestine.