What ingredient controls yeast?

Answer 1

Yeast is a living organism. There are thousands of different yeast micro-organisms, but the one most commonly used in baking is Saccharomyces cerevisiae. If you purchase active dry or instant yeast, there may be other ingredients, commonly ascorbic acid. SAF instant yeast also contains sorbitan monostearate. If you are inquiring because of food Allergies or concern about additives, be sure to check the label.

Answer 2

Sugars are digested by yeasts. Note that this does not require the explicit addition of sugar in its pure and crystalline form; the sugars contained in wheat flour, for example, are perfectly sufficient to feed yeast sufficiently for savory dough such as Pizza or bread dough.