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Older people are more likely to have a deficiency because they might not absorb vitamin B12 as well as they used to
PMC 3328495
VITAMIN B12 When youre deficient in vitamin B12, you may feel tired, depressed, or overall drained
The body tightly regulates B12 absorption through intrinsic factor, a protein produced in the stomach that binds to B12 and facilitates its uptake in the terminal ileum
(June 2002)
However, if the pain persists or worsens beyond a week, it may indicate a more serious issue
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