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Combine Diet and Supplements for Optimal Intake Try to get your daily intake of vitamin B12 from food sources, such as liver, beef, shellfish, salmon, tuna, dairy, eggs, fortified cereals, and nutritional yeast

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REFERENCES USED AS SOURCES FOR THIS PAGE: 1 Vitamin B12 injection via Cleveland Clinic

Key Takeaways The standard initial dose for severe deficiency is 1,000 mcg intramuscularly daily or every other day

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Chronic stress and alcohol abuse may also indirectly affect B12 levels