No not grocery store yeast. If you go to the grocery store, you need to buy nutritional yeast. It is not cheap but it packs more niacin per tablespoon than brewer's yeast.
I buy Josh's frogs brewer's yeast. it is not human food grade: its manufactured for reptiles! Not all brewer's yeast contains niacin. Be sure to check the formulation of any brewer's yeast you buy: make sure it contains niacin. I use Josh's frogs [I either buy it from Amazon as I have prime...