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Food Sources Fish, shellfish Liver Red meat Eggs Poultry Dairy products such as milk, cheese, and yogurt Fortified nutritional yeast Fortified breakfast cereals Enriched soy or rice milk Signs of Deficiency and Toxicity Deficiency Measuring vitamin B12 in the blood is actually not the best way to determine whether someone is deficient, as some people with a deficiency can show normal B12 blood levels

They may need to rely on supplements or vitamin B12 injections to maintain adequate levels, and the frequency of supplementation will affect how long the vitamin stays in the body

Increase to 0.5 mg weekly for the next 4 weeks

When B12 levels are low, the body may struggle to function efficiently