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hardlikearmour is a trusted home cook.
It's a product commonly used in vegan cooking to give things a somewhat cheesy flavor. I think it's a good source of some of the B vitamins, but don't quote me on that. If you don't have it, you could use parmesan instead for a similar flavor addition (assuming you are not vegan, of course).
Yes, it has a cheese- like flavor and unlike Brewer's yeast, contains the vitamin B 12 which is found mostly in meat and dairy,which vegans don't consume and vegetarians may not get enough of. I use it as a topping on my salads, too.
I love nutritional yeast - especially on popcorn. It has a ton of B vitamins in it and does have a very cheesy, buttery taste. You can find it at health food stores, mostly.
Whole foods usually has it in their 'bulk' section. I love it too!
You will LOVE it. It's SO good. Lots and lots of vitamins and minerals. A super food. Don't skip it and definitely try it on popcorn as well as in a vegan mac and cheese recipe. Oh my gush! So good. Enjoy.