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Simply taking a daily supplement may not be the right course of treatment for you. Causes of Vitamin B12 Deficiency Identifying the cause of vitamin B12 deficiency is key to being able to treat it with the right approach as well as ruling out anything else that may be causing it

When caused by a common viral infection, lymph nodes typically start to shrink within a week and often resolve within 24 weeks

Vitamin B12 is important for the production of myelin sheaths, which are protective coatings around the nerves and brain cells

Vitamin B12 is essential for energy production, brain function, and red blood cell formation

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