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It also plays a vital role in maintaining healthy nerve cells, improving concentration, boosting the immune system, and enhancing overall metabolic function
For example, symptoms of a Vitamin B12 deficiency may include: Loss of appetite Constipation, diarrhea, or both Weight loss Changes in how you move around Irritability or changes in how you feel or behave Confusion Brain fog or difficulty thinking Depression Impaired memory or cognition Sore or red tongue Mouth ulcers Altered vision Pins & needles Muscle weakness Fatigue and tiredness Nausea Treatment for a vitamin B-12 deficiency is usually accomplished through dietary changes, supplements, and sometimes, B-12 injections
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doi:10.1002/ana.22229
Diagnosis of deficiency Diagnosis of vitamin B12 deficiency is mainly based on laboratory blood tests