Facts about Vitamin B12

1. 07

   Red blood cells require vitamin B12 for DNA synthesis during their 120-day lifespan, and deficiency causes megaloblastic anemia characterized by abnormally large immature cells.

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2. 06

   Patients with pernicious anemia require vitamin B12 injections of 1,000 micrograms monthly because oral supplements cannot be absorbed without functional intrinsic factor in the digestive tract.

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3. 05

   Methylcobalamin and adenosylcobalamin are the two active coenzyme forms of vitamin B12 in human cells, each serving distinct metabolic roles in energy production and nervous system function.

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4. 04

   Cyanocobalamin, the synthetic form of vitamin B12 used in supplements, was first crystallized in 1948 by scientists who won the Nobel Prize in Chemistry for isolating the compound from liver extracts.

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5. 03

   Only bacteria and archaea can synthesize vitamin B12 de novo, which is why animals obtain it exclusively through consuming microorganisms or other animals that have accumulated the vitamin.

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6. 02

   Intrinsic factor, a protein produced by stomach cells, is essential for vitamin B12 absorption in the terminal ileum, and its deficiency causes pernicious anemia affecting approximately 1 in 10,000 people.

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7. 01

   The human liver stores approximately 2,000 to 5,000 micrograms of vitamin B12, enough to sustain normal function for three to five years without dietary intake.

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