Yeast Extract, FMB Grade by Biologix is a powder made from protein-rich edible yeast by autolysis and enzymolysis, supplying polypeptides, amino acids, nucleotides, B vitamins and trace elements to LB and other culture media. Total nitrogen is at least 10.0% and a 2% solution dissolves completely at pH 5.3–7.2. 500 g bottles, 36-month shelf life.