envelopes active dry yeast —

Active dry yeast is a commercial preparation of the microorganism Saccharomyces cerevisiae, processed and dried into granular particles for use in baking and fermentation. The yeast cells are killed during processing, then dried to preserve their leavening power, resulting in a dormant product that reactivates when rehydrated with warm liquid. Each envelope typically contains approximately 2.25 teaspoons or 7 grams of yeast, sufficient to leaven a standard loaf of bread or batch of dough.

Active dry yeast differs from fresh cake yeast in moisture content and shelf stability; the granular form has a larger particle size and coarser texture than instant yeast, requiring slightly longer hydration times. The flavor is neutral with subtle earthy notes, though its primary function is biochemical rather than organoleptic—the living cells ferment sugars in dough, producing carbon dioxide gas that causes rising, while also developing flavor compounds through the fermentation process.

Active dry yeast is the standard leavening agent in bread baking, pizza doughs, sweet rolls, and other yeast-risen baked goods across Western and global cuisines. It is also essential in brewing, winemaking, and the production of other fermented beverages. The yeast is typically rehydrated in warm water (105–110°F / 40–43°C) before incorporation into dough, though it can be mixed directly with dry ingredients if added liquid is heated to the proper temperature. Proper activation—blooming the yeast in water to confirm viability before use—ensures reliable rise and prevents dense results from dead or expired yeast. It pairs with all flours and dough compositions.