Vitamin B12 plays an important role in red blood cell formation, DNA synthesis, and normal nervous-system function. When your body does not have enough vitamin B12, symptoms can include fatigue, weakness, difficulty concentrating, numbness or tingling, balance problems, and other neurological changes.

Stress can affect how you feel physically and mentally, but stress itself is not considered a primary cause of vitamin B12 deficiency. B12 deficiency is more commonly linked to inadequate dietary intake, difficulty absorbing the vitamin, certain medical conditions, gastrointestinal surgery, and some medications.

For patients who are deficient or have difficulty absorbing vitamin B12, B12 injections may be one treatment option. The right approach depends on the cause of the deficiency, your symptoms, medical history, and laboratory findings.

How Vitamin B12 Supports Your Nervous System and Health

Vitamin B12 is essential for healthy red blood ce