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5. Nausea
We may find ourselves feeling nauseous from time to time and there are many possible reasons behind this. Sometimes, we feel nauseated after sitting in a moving car for a long time or when we smell something unpleasant. Not known to many, nausea can actually be due to having too much vitamin B12 in your system.
Sometimes, nausea due to vitamin B12 toxicity can get so severe that it can cause vomiting. In fact, nausea itself can bring a lot of discomforts since it prevents us from performing our daily activities. If you think that your Vitamin B12 supplements are making you feel nauseous, you should stop taking it.
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