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Getting older
Headaches Mild headaches can occur, often linked to dehydration or metabolic changes
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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
Spacing doses prevents deficiencies and adverse effects
Others may notice gradual improvement over the first few days
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