Active Dry Yeast "Produced by carefully grown specific strains of yeast -Saccharomyces cerevisiae. Application-Probiotic functional feed ingredients for Aquaculture,Poultry and cattle. Shelf life-18 months Viable cell count-20 billion CFU/Gram,Protein-40.5-43.5% Baker's yeast contains enzymes that can reduce a carbonyl group into a hydroxyl group in fairly high yield, thus making it useful for bio transformations in organic syntheses. It is known to reduce organometallic carbonyl compounds in very high yield."