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What does it mean when someone say theat they have a lack in B12 vitamins?

1 doctor weighed in
Dr. Roy Arnold
Internal Medicine

In brief: B12 deficiency

occurs when intake of B 12 is inadequate, such as a strict vegan diet, or when absorption is impaired.
Impaired absorption can occur if the intestine is diseased such as in Crohn's disease or a key cofactor is absent as in Pernicious anemia. Thanks for trusting HealthTap!

In brief: B12 deficiency

occurs when intake of B 12 is inadequate, such as a strict vegan diet, or when absorption is impaired.
Impaired absorption can occur if the intestine is diseased such as in Crohn's disease or a key cofactor is absent as in Pernicious anemia. Thanks for trusting HealthTap!
Dr. Roy Arnold
Dr. Roy Arnold
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