What is the normal range of B12 by age?
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4 min read
According to the National Institutes of Health (NIH), a serum vitamin B12 level above 300 picograms per milliliter (pg/mL) is considered sufficient for adults. However, the normal range of B12 by age is not static, as a person's ability to absorb this vital nutrient can change over their lifetime, particularly in older adulthood.
