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June 16, 2021 3:45 PM Howard LeWine, M.D., Harvard Health Publishing
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Q: Should I be taking a vitamin B12 supplement?
A: B12 (also known as cobalamin) is essential for keeping your brain and nerves healthy and for making DNA and red blood cells. We typically get B12 through diet. Rich sources include beef, liver, clams, poultry, fish, fortified cereals, eggs, cheese, yogurt, milk and fortified plant milks (like soy, almond or rice milks).
For us to digest B12, we first have to shake it loose from these foods. Stomach acid helps do that. The freed-up vitamin then binds to a protein (intrinsic factor, produced by cells in the stomach lining) and makes its way to the small intestine, where it’s absorbed into the bloodstream.
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