Best Naturals, Brewer's Yeast Powder, 16 OzProduct Description Brewer's yeast is a natural source of protein, several B vitamins and minerals. It is produced by cultivation of saccharomyces cerevisiae on rated barley in the production of beer. After fermentation, the yeast is separated from the beer, roller dried and debittered. Brewer's yeast is a general body tonic and nutrient dense food for all ages. Product Benefits Supports Healthy Glucose Metabolism. Natural Source Of Protein And