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Not a standalone diagnosis: The B12 test is often interpreted alongside other tests like folate, methylmalonic acid (MMA), or homocysteine levels
The vitamin also influences the growth of strong nails and shiny hair
For some individuals, this conversion works adequately
People with this condition need lifelong vitamin B12 replacement therapy
Other common reasons are a local injection-site reaction, your body adjusting to corrected levels, and an underlying deficiency that was more severe than expected
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