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For this reason, it is our form of choice here

Vitamin B12: A vital vitamin that is involved in energy production, nerve function, and the formation of red blood cells

However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing

Symptoms of B12 deficiency A vitamin B12 deficiency may go undiagnosed because many of the symptoms fatigue, weakness, constipation, loss of appetite, and weight loss mirror those of minor illnesses or chronic conditions, Nelson explains

Pernicious anemia is a common reason for low B12