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Aging athletes, especially those over the age of 60, are also at risk for deficiency with age-related atrophic gastritis, low stomach acid, and an inadequate amount of a certain protein needed to absorb B12 (intrinsic factor)
When its low, fatigue and mood changes can intensify
While the injections take hold relatively fast, their effects are not immediate
Since your body cannot absorb naturally produced B12 from gut bacteria, animal-based dietary sources like meat, fish, eggs and dairy[5] as well as fortified foods or supplements are necessary to meet daily needs
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