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These are common signs people bring up when they ask us about B12: Ongoing tiredness or low energy Trouble concentrating or remembering Pale skin Mood changes or irritability Feeling lightheaded or weak If several of these sound familiar, a simple blood test can help you and your provider decide on the next steps

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If you havent had a regular source of B12 for more than a few months, take 2,000 g once a day for 2 weeks to replenish your stores