How much vitamin B12 is too much mcg and is there a tolerable upper limit?
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3 min read
According to the National Institutes of Health (NIH), no tolerable upper intake level has been established for vitamin B12 because of its low potential for toxicity, even at high doses. This is because the body, being water-soluble, excretes any excess, meaning that for most people, determining how much vitamin B12 is too much mcg is less of a concern than ensuring adequate intake.
