> According to researchers, vegans and vegetarians are the most
> likely to be deficient because the best sources of the vitamin are
> meat, particularly liver, milk and fish.
LIE, http://www.ecologos.org/B-12.htm, documents the fact that
people
eating a plant-based diet are NOT subject to B-12 deficiency as
your
ongoing, mindless meatarian-propaganda falsely claims.

The above is a cherry picked bit of propaganda too. Plants do not
produce vit b12, plants that come into contact with manure or other soil
ssources can contain some small amount of it. Animals produce it in
their large gut, where it can get in soil, and then back to animals and
into their flesh as a cycle. Humans get it by tapping somewhere into
the cycle. Any vit b12 associated with plants is incidental to the
cycle.

some facts:

iagnosis
of vitamin B[12] deficiency is typically based on measurement of
serum
vitamin B[12] levels; however, about 50 percent of patients with
subclinical disease have normal B[12] levels. A more sensitive method
of screening for vitamin B[12] deficiency is measurement of serum
methylmalonic acid and homocysteine levels, which are increased early
in vitamin B[12] deficiency. Use of the Schilling test for detection
of pernicious anemia has been supplanted for the most part by
serologic testing for parietal cell and intrinsic factor antibodies.
And:

According to the National Institutes of Health, vitamin B12
deficiency
can lead to a wide spectrum of conditions, such as anemia, dementia
and reduced cognitive functioning. Vitamin B12 deficiency is a
significant health issue. Nearly 40 percent of the U.S. population is
B12 deficient (Tufts University, Boston). This includes a sizable
number of patients who are severely deficient and are currently being
treated.

Further, a vast number of people are completely unaware they are B12
deficient and will eventually need treatment. Seniors and strict
vegetarians are most at risk. Symptoms such as fatigue, constipation,
loss of appetite and weight loss can occur in those who are
deficient.

Currently, physicians rely on B12 shots for people with vitamin B12
deficiency because of the poor bioavailability of oral formulations.
Past studies have shown that only approximately one percent of a
vitamin B12 tablet gets absorbed in the bloodstream after traveling
through the digestive track. Because so much of the vitamin is
wasted,
alternatives to effectively treat or protect against B12 deficiency
are needed.