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Foods which contain high levels of methionine include cheese, eggs, fish, meats, spinach, potatoes, Brazil nuts, sesame seeds, and select other plant seeds

Peripheral neuropathy, subacute combined degeneration of the spinal cord, or cognitive impairment indicate more advanced deficiency and generally require intensive treatment over extended periods

PO vitamin B 12

The first signs of B12 deficiency include persistent fatigue, weakness, lightheadedness, pale skin, tingling or numbness in the hands and feet, difficulty concentrating, and mood changes like irritability or mild depression

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