Hello Juanita! I have seen cake yeast on a cooking show a long time ago. I have never used it though. I sugguest you test to see if it is "active" by breaking off a small portion and putting it in lukewarm water with a pinch of sugar. Look for bubbles. If you see them, it should be ok to use. Do you have a recipe that calls for "cake yeast"? I hope I helped some!