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Vitamin B12 is only found in animal products.
Some animal products that contain large doses of B12 are:
organ meats (liver, kidney, etc.)
bivalve mollusks (clams, oysters)
Slightly
smaller doses of B12 can be found in:
egg yolks
muscle meat
poultry
fish
fermented cheeses
dry milk
For
vegetarians the most valuable source of Vitamin B12 is often
fortified breakfast cereals.
 Fortified
means that nutrients are added to a food during food processing.
Vitamin
B12 is bound to the protein in foods that you eat. Hydrochloric
acid in your stomach binds with Vitamin B12 to release the
vitamin from the protein during digestion. After the B12 is
released from the protein it combines with something called an
intrinsic factor and can be absorbed into the intestine.
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