SAF Instant Red Yeast is a type of yeast that is commonly used as a leavening agent in baking. It is made from a strain of yeast that has been specifically bred to produce a vibrant red color, and is often used in recipes that call for a long fermentation process, like sourdough bread. SAF Instant Red Yeast is easy to use and requires no activation, allowing for faster and more convenient baking. It has a mild and slightly sweet flavor that does not overpower the other ingredients in a recipe.