pkg. dried yeast
Dried yeast is a source of B vitamins (thiamine, niacin, riboflavin) and contains protein and trace minerals including selenium and chromium. When used in small quantities for leavening, nutritional contribution is minimal, but nutritional yeast (deactivated) is often consumed as a supplement for its micronutrient density.
About
Dried yeast is a dehydrated form of Saccharomyces cerevisiae, a unicellular fungus that ferments sugars to produce carbon dioxide and ethanol. The yeast cells are grown in controlled fermentation conditions, then harvested and dried through spray-drying or drum-drying processes to create dormant, shelf-stable granules or powder. Commercial dried yeast typically contains living but inactive cells that rehydrate and activate when mixed with warm liquid, restoring metabolic function for leavening and fermentation applications.
Dried yeast exists in several forms: active dry yeast (larger granules with more dead cell material), instant yeast or bread machine yeast (finer particles with higher cell viability), and rapid-rise or bread machine varieties (treated for faster activation). The flavor profile is mild and slightly nutty when dormant, with aromatic compounds developing during fermentation.
Culinary Uses
Dried yeast is the primary leavening agent in bread baking, where it ferments dough and produces gas bubbles that create crumb structure and volume. It is essential in artisanal and commercial bread production, including yeasted cakes, enriched doughs (brioche, challah), and pizza dough. Beyond baking, dried yeast is used in brewing and winemaking to ferment sugars into alcohol, and in some savory applications like nutritional yeast (deactivated form) for umami flavoring. Proper rehydration in warm water (105–110°F / 40–43°C) is critical for activation and consistent fermentation rates.