Vitamin B12 deficiency results in megaloblastic anemia, GI lesions, and neurologic damage (which begins with an inability to produce myelin and is followed by gradual degeneration of the axon and nerve head)
Since B12 is responsible for critical functions like energy production, DNA synthesis, and nerve protection, low levels can significantly affect your day-to-day wellness

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People with low B12 sometimes experience irritability, sadness, or brain fog
This includes those with pernicious anemia or gut problems