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B12 vitamin is a chemical compound that is produced by special types of bacteria.
It is not a naturally occurring substance and human intake is subject to the presence of this vitamin in the food that they eat. B12 is essential for the effective functioning of vital organs of the human body. Vitamin B12 foods are the primary source of this vitamin for humans and these types of food are invariably non vegetarian.
Since it can be produced only by bacteria that live within animals, non-vegetarians can get adequate amounts of this vitamin via their food intake. Vegans will need to supplement their diet with artificial sources of this compound. Vitamin B12 foods, which have the most abundant supply of B12 vitamin, are sea food, especially the shellfish variety. Clams, Oysters and Mussels are the most highly recommended Vitamin B12 foods.
These food types are rich with bacteria that produce B12 vitamin and as a result, they have a high percentage of B12 vitamin that can be absorbed by the human body.
Cooking these foods do not destroy the vitamins and therefore are effective for human sustenance. only a few micrograms per day.
So, the excess levels are cleansed away by the body without any adverse side effects. B12 food origins This table is taken from The office of diatary supplements in the american national health institute.
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Found At: (B12 vitamins) http://www.b12-vitamin.org/