I just found it out

>For a good complete info in Vitamin B12 I'd recommend to read
>http://www.veganoutreach.org/health/b12.html

If you like to read about b12, now it's a PDF,
http://veganoutreach.org/health/B122002.pdf

And it's even better

B12 supplementation is to be recommended for vegans.
Or smokers (excrete more).

regards

Amadeus