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<b>Nutritional Yeast:</b>Yeast is used in nutritional supplements popular with vegans and the health conscious, where it is often referred to as "nutritional yeast". It is a deactivated yeast, usually Saccharomyces cerevisiae. It is an excellent source of protein and vitamins, especially the B-complex vitamins, whose functions are related to metabolism as well as other minerals and cofactors required for growth. It is also naturally low in fat and sodium. Some brands of nutritional yeast, though not all, are fortified with vitamin B12, which is produced separately from bacteria. Nutritional yeast, though it has a similar appearance to brewer's yeast, is very different and has a very different taste.<br><br><br><br><b>Brewer's Yeast:</b><br><br>
Brewer's yeast is derived from the unicellular fungus Saccharomyces cerevisiae, which causes the fermentation process basic to the brewing of beer. Different strains of this yeast are used in the production of the various types of beer. Still other strains are used in the fermentation of dough to produce bread. The strains of Saccharomyces cerevisiae that are used for the production of bread are collectively called baker's yeast.<br><br><br><br>
Dried brewer's yeast is a rich source of several nutrients, including the B vitamins thiamin, riboflavin, niacin, pyridoxine, pantothenic acid, folate, vitamin B12 and biotin, and such trace minerals as chromium and selenium. It also contains beta-glucans (see Yeast Beta-Glucan), ribonucleic acid or RNA (see Nucleic Acids/Nucleotides), para-aminobenzoic acid and myo-inositol. A substance isolated from brewer's yeast called skin respiratory factor or SRF has found application in some cosmetic and wound-healing products, as well as in some hemorrhoidal preparations. The chemical identity of SRF is unknown.<br><br><br><br>
Brewer's yeast has been a popular nutritional supplement for many years. Much of the brewer's yeast marketed for nutritional supplement use is grown specifically for that marketplace. The supplements are prepared from dry, crushed cells of Saccharomyces cerevisiae. The cells are not alive.<br><br><br><br><b>Probiotics:</b><br><br>
Some probiotic supplements use the yeast Saccharomyces boulardii to maintain and restore the natural flora in the large and small gastrointestinal tract. S. boulardii has been shown to reduce the symptoms of acute diarrhea in children, prevent reinfection of Clostridium difficile, reduce bowel movements in diarrhea predominant IBS patients, and reduce the incidence of antibiotic, traveler's, and HIV/AIDS associated diarrheas.<br><br><br><br>
Saccharomyces boulardii is a tropical strain of yeast first isolated from lychee and mangosteen fruit in 1923 by French scientist Henri Boulard. It is related to, but distinct from, Saccharomyces cerevisiae in several taxonomic, metabolic, and genetic properties.[1]<br><br><br><br>
S. boulardii has been shown to maintain and restore the natural flora in the large and small intestine; it is classified as a probiotic. Boulard first isolated the yeast after he observed natives of Southeast Asia chewing on the skin of lychee and mangosteen in an attempt to control the symptoms of cholera. S. boulardii has been shown to be non-pathogenic, non-systemic (remains in the gastrointestinal tract), and grows at the unusually high temperature of 37°C.<br><br><br><br>
I have and use both nutrtional and brewer's. I had thought they were one in the same.
 
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