The catch is that B12 is one of the few nutrients you cannot get from an unfortified plant diet
To increase the amount of vitamin B12 in your diet, eat more foods that contain it, such as: Beef, liver, and chicken Fish and shellfish such as trout, salmon, tuna, and clams Fortified breakfast cereal Low-fat milk, yogurt, and cheese Eggs Your doctor might recommend that you also take a vitamin B12 supplement
The optimal frequency and dosage varies person to person
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