Nutritional yeast is different than yeast that one bakes with. Make sure that if you do get the nutritional yeast, that it is in fact "NUTRITIONAL" and not "BAKERS" yeast.
I tried it before and I didn't notice a difference at all. But I get monthly B12 shots anyway.
I'm adding this in for anyone who wants to try it that is not familiar with it. Before loading it into a recipe, just try a few flakes of it. It's got a nice taste to it, but one can easily overpower a recipe by using a lot of it. I noticed that it has a strong aftertaste if too much is used.