Nutritional yeast, I assume you mean brewers yeast (the yellow, flaked, stuff)? If so it seems that the version with the most nutritional value would be the fortified brewers yeast. Info here:
https://www.healthline.com/nutrition/nutritional-yeast
https://www.womenshealthmag.com/food/a26814464/nutritional-yeast-benefits/
The main selling nutritional yeast is Red Star, they also sell baking yeast. Isn’t brewers’ yeast any more, it is manufactured specifically and has added B vitamins. Thanks for the links, this is from one of them, I need to find a package of Red Star nutritional yeast and see what is says specifically. Lots more information at links. I have used nutritional years for decades. After reading all the niacin info, I have upped my intake.
Some of the main nutritional benefits of nutritional yeast include:
It is a complete protein: Nutritional yeast contains all nine essential amino acids that humans must get from food. One tablespoon contains 2 grams of protein, making it an easy way for vegans to add high-quality protein to meals (2Trusted Source).
It contains many B vitamins: One tablespoon of nutritional yeast contains 30–180% of the RDI for B vitamins. When fortified, it is especially rich in thiamine, riboflavin, niacin, vitamin B6 and vitamin B12.
It contains trace minerals: One tablespoon contains 2–30% of the RDI for trace minerals, such as zinc, selenium, manganese and molybdenum. Trace minerals are involved in gene regulation, metabolism, growth and immunity (3Trusted Source, 4).