Vitamin B-12 is supplied almost entirely by

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Vitamin B-12 is primarily found in animal products such as meat, poultry, fish, eggs, and dairy. It is not commonly found in plant-based foods, making it difficult for vegans and vegetarians to get enough B-12 in their diets without supplementation. While intestinal bacteria can produce some B-12, it is typically not enough for human requirements. Whole grain cereals and legumes may be fortified with B-12 but are not a reliable source.

Vitamin B-12 Is Supplied Almost Entirely by