Solgar Unflavored Brewers Yeast Powder, 400 GmSolgar Brewer's Yeast Powder, Unflavored, 400 Gm, is a natural primary Brewer's Yeast (Saccharomyces cerevisiae) that serves as a source of amino acids, Bcomplex vitamins, and other nutrients. Unlike most Brewer's Yeasts derived from beer fermentation, which involves grains, malt, active yeast, and hops, Solgar's product undergoes a special drying process to preserve its nutritional content while minimizing bitterness. This yeast powder is designed to