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A commonly used functional approach is selenium 200 mcg daily
When to seek medical care Adults should seek medical care if they have unexplained fatigue, weakness, shortness of breath, dizziness, numbness or tingling in the hands or feet, balance problems, memory changes, or a sore tongue
If you are vegetarian or vegan, look for fortified foods or take a B12 supplement as recommended by a healthcare provider
Seek immediate medical attention for signs of a severe allergic reaction including hives, swelling of the face, lips, tongue, or throat, difficulty breathing, or chest tightness
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