Bluebonnet's Milk-Free Probiotic Acidophilus Plus FOS Powder provides over ten billion viable, healthy microorganisms per gram. This probiotic formula is specially formulated with lactobacillus acidophilus (3.3 billion), lactobacillus bulgaricus (3.3 billion), and bifidobacterium (bifidum and longum, 3.3 billion) in a unique 100 mg base of FOS (fructooligosaccharides). FOS is a unique carbohydrate from Jerusalem Artichoke flour. Designed to help promote the growth of friendly bacteria in the gastrointestinal tract. Available in easy-to-mix powder for maximum assimilation and absorption.