Dietary Supplement. Premium. Natural. Unsweetened. Unfortified. Nothing added. Naturally delicious. Suitable for vegetarian. Free of: dairy, soy, artificial flavor, sweetened, preservatives and color. Since 1947. Description: A natural primary Brewer's Yeast (Saccharomyces cerevisiae) that provides a source of amino acids, B-complex vitamins and more. Source: most brewers yeast are derived from the fermentation of beer: such fermentation involves using grains (such as rice or wheat), malt, active yeast and the dried flowers of hops. Although efforts are made to debitter the yeast prior to final drying operations, most Brewer's Yeasts are, nevertheless, left with a bitter odor. After fermentation, the yeast is collected and drifted using special techniques to preserve its protein, vitamin and mineral content. Typically Naturally Occurring Amino Acid Profile Per Serving (Approximate Values): L-Alanine 1080 mg; L-Arginine 750 mg; L-Aspartic Acid 1710 mg; L-Cysteine 270 mg; L-Glutamic Acid 3330 mg; L-Glycine 780 mg; L-Histidine 870 mg; L-Isoleucine 750 mg; L-Leucine 1230; Ly-Lysine 1170 mg; L-Methionine 270 mg; L Phenylalanine 750 mg; L-Proline 660 mg; L-Serine 930 mg; L-Threonine 930 mg; L-Tryptophan 120 mg; L-Tyrosine 330 mg; L-Valine 900 mg. Note: L-Tryptophan is naturally occurring, not added. For more information, call toll-free 1-877-Solgar 4. www.solgar.com. This product is sold by weight, not by volume; therefore settling may occur.