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What is a normal B12 level for a 50 year old?

According to the National Institutes of Health, vitamin B12 deficiency is more prevalent than previously thought, especially among older adults. Understanding what is a normal B12 level for a 50 year old involves more than just a single number, as absorption can decrease with age, even with adequate dietary intake. This means a "normal" level can still be insufficient for optimal health in some individuals, particularly those over 50.