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B12 is made by microorganisms then are eaten by animals then we eat...

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To get B12 absorbed a healthy stomach, pancreas and small intestine are needed

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Your active when B12 is in its active forms methyl and adenosyl

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B12 is required to protect the optic nerves

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B12 produces neurotransmitters for cognitive functioning

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B12 is critical for a normal brain, normal life

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B12 is also essential for
DNA construction, healthy blood and cardiovascular systems

Top reasons for deficiency
1. Malabsorption 2. Insufficient intake 3. Genetic defects