> sure, the b12 is kept in a bifidus. If your diet is too much alkaline or
too
> much acid, then this bifidus disappears, then you loose your b12.

what is the correct  range of ph in the intestine in which bifidus bacteria
thrive and survive ?

That's
> actually what i experienced having just a alkaline diet, as soon as i
added
> some acid, my level rose. it's been a while now that i haven't needed
> anything else than a good balance of foods :)

what is that balance ? what proportion between acid and alkaline ? had you
your b12 status tested before after ?
what brings acid to your diet ?

jean-claude