Yeast is a living organism that forms colonies of single, simple cells. In warm, moist conditions they produce carbon dioxide and alcohol as they "eat" food. For thousands of years it has been used to produce bread and beer. Producing a bitter taste when it is utilized in the production of bread, Brewer`s yeast produces, however, a desirable flavor when put to use in the production of beer and so has long been employed in this purpose, from which it draws its name. More recently it has found new purpose as a nutritional supplement, containing chromium, selenium and numerous vitamins including B1, B2, B3, B5, B6, and B7. It has also found use in some theaters and homes as an alternative to salt or butter on popcorn, with many people enjoying the flavor that it adds. Medically, it is sometimes used to aid digestive issues, particularly those involving diarrhea. In some circumstances it has also been used to aid those with Crohn`s Disease. Some studies, but not all, have also displayed results showing that Brewer`s Yeast can even be of use in aiding in controlling blood sugar levels. This is a 1lb bag of brewer`s yeast flour.