Zalan, a raw foodie in Hepburn Springs, has an article about how he cured his B12 deficiency. It's actually an interesting read because it shows that you can raise B12 levels without supplements (although another time he did use supplements).
Anyway his website is
www.vegadeva.com.au/ and then you go to Books/Articles > My B12
I have noticed that if I'm under stress (such as when my father died, and when I had exams) I
feel low in B12. I can't explain it, I just do! Then I take a (vegan) supplement and I feel better.
I know this doesn't really answer your question either but thought I would put it in the mix!