Nutritional yeast is usually fortified with B12 produced by bacteria according to
Nutritional yeast - Wikipedia, the free encyclopedia
If you would like to get to the most direct vegan source, drink kombucha. Kombucha tea has an excellent source of B12 that is not fortified from a separate source. It is a r
aw living food as well as vegan. 16 ounces of
GTS Kombucha contains 20% of the RDA for B12 as well as the other B vitamins.