The yeast itself will provide a good amount of Vitamin B, I am not sure about the rest of it though.
http://bavarianbrewerytech.com/news/guess.htm looks to have some good info on the overall nutritional content of beer and its components.
If it were me I would crush a multivitamin and add that to a single beer on bottling to see what it tastes like and how it reacts to the process.