MICRONUTRIENTS IN THE HUMAN BODY-VITAMIN B12

Vitamin B₁₂ (cobalamin) serves as a cofactor for several essential biochemical reactions in humans.  Deficiency of vitamin B₁₂ leads to megaloblastic, gastrointestinal symptoms, and neurologic abnormalities.  Although deficiency of vitamin B₁₂ due to an inadequate supply in the diet is unusual, deficiency of B12 in adults—especially older adults—due to inadequate absorption of dietary vitamin B₁₂ is a relatively common and easily treated disorder.

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