Dietary Supplement Super Strength Proprietary Blend Designed to Maintain Healthy Intestinal Flora Laboratory Guaranteed Quality Tested 21st Century...For a Healthier Future Acidophilus Probiotic Blend 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.