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(2) Vitamin B12 is found naturally in a wide variety of animal proteins, so the body can obtain the recommended amounts of vitamin B12 by eating a variety of foods including: Organ meats (beef liver) Shellfish (clams) Meat, poultry, eggs, milk and other dairy foods Fortified cereals and nutritional yeasts A lack of vitamin B12 (B12 deficiency) occurs when the body does not get or is unable to absorb the amount of vitamin that the body needs
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