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Regular check-ups and blood tests can determine if there is a deficiency
Administration routes include intramuscular and subcutaneous injections
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
Some researchers have studied vitamin B12 to find out if it can increase energy and endurance during exercise, but the results are inconclusive
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