> Jeff,
 > Did you nutritionist give an indication of the reason for so little
 > absorption?  Oliva

He said it is usually the lack of intrinsic factor or poor digestion that
leads to B12 deficiency.  The absorption occurs at the end of the small
intestine.  From what I gather intrinsic factor is genetically governed.
Don't know if citric acid acts the same on protein breakdown as acetic acid.
I think the reasoning behind the vinegar is the increase in stomach acid and
a better breakdown of meat, releasing the B12 to be absorbed.  The best way
to find out is to try it and test it for yourself.  I look at every claim
with a jaundice eye these days.

Jeff