酵母是芽胞菌，有芽、胞兩種存在形式。對自然界的抵抗力強，不易被殺死。隻要被稱為酵母，一定具有活性。酵母提取物是失活的

樓主文中提到的那種“有機酵母”，實際上是工業加工的滅活製品，可以直接食用。不能用來發酵做麵食。

https://www.epicurious.com/ingredients/what-is-nutritional-yeast

What actually is nutritional yeast?

Nutritional yeast (nickname “nooch”) is a dried, deactivated form of Saccharomyces cerevisiae, an ancient species of yeast. Like baker’s yeast—and the hundreds of types of yeast that exist all around us—nutritional yeast starts as wild yeast, which grows naturally on cane or beet molasses. The yeast is picked, rinsed, and heat-dried to destroy any live cultures, thus deactivating the yeast and stripping it of its leavening properties. Brewer’s yeast—a by-product of beer-brewing—is similarly inactive, rendered so by rising alcohol levels and pasteurization. Though both nutritional and brewer’s yeast descend from the same fungus as baker’s yeast (often sold as either fresh cake yeast or active dry or instant yeast pellets), these deactivated types of yeast cannot be used as a leavening agent in bread or pastries.

 

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