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Am I at risk of getting too much vitamin B12?

. Good evening, ma'am. Based on the information you have provided, I believe that taking 100 units of vitamin B12 every 10 days is unlikely to cause any negative effects on your heart. Cyanocobalamin (vitamin B12) poisoning is very rare, and your test results are within the normal range. Therefore, I would not worry about taking too much in your case.