@Black Sheep
Who's suggesting a vegan diet?
Vitamin B-12 is manufactured by friendly bacteria in the intestinal tract. This is true for all vegetarian animals, including human beings. I've known a few people deficient in B12, they(my brother, father-in-law, and a good friend) were all big meat eaters.
A deficiency of Vitamin B-12, which is a forerunner of pernicious anemia, is not necessarily due to dietary inadequacy. A report released from a Vitamin B-12 Conference stated, "Pernicious anemia appears to arise not from shortage in the diet, but from impairment of the ability to absorb Vitamin B-12." (Proceedings of the Nutrition Society, 71st Scientific Meeting, London School of Hygiene and Tropical Medicine, January 5, 1952, p. 295)