Why do older adults need Vitamin B12 for myelin and red blood cells?

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Vitamin B12, or cobalamin, is essential for older adults because it acts as a critical cofactor in DNA synthesis and myelin maintenance, processes that become less efficient with age.

• Myelin Integrity: B12 supports the production of myelin, the protective sheath around nerve fibers. Without adequate levels, demyelination can occur, leading to neurological symptoms such as balance issues, tingling, or cognitive fog. Regular blood tests can help monitor these markers early.
• Red Blood Cell Maturation: This vitamin is vital for bone marrow to produce healthy red blood cells. Deficiency causes cells to grow abnormally large (megaloblastic), reducing their oxygen-carrying capacity and leading to fatigue or weakness.
• Absorption Challenges: As the stomach ages, it produces less intrinsic factor, a protein needed to absorb B12 in the small intestine. Up to 30% of adults over 60 may have low absorption rates.
• Dietary Sources: Prioritize animal-based foods like eggs, dairy, and lean meats. If following a vegan diet, consult a physician about supplementation.
• Supplementation Options: In the UK, hydroxocobalamin is a common injectable form, while in the US, cyanocobalamin or methylcobalamin are standard oral supplements. Daily doses typically range from 2.4 to 6 micrograms for maintenance, though therapeutic doses may vary based on lab results.

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