酵母是芽胞菌，有芽、胞两种存在形式。对自然界的抵抗力强，不易被杀死。只要被称为酵母，一定具有活性。酵母提取物是失活的

楼主文中提到的那种“有机酵母”，实际上是工业加工的灭活制品，可以直接食用。不能用来发酵做面食。

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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