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Elderly Individuals : Older adults often have decreased stomach acid production, which can lead to reduced B12 absorption
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12 GuZ.-F.Yu-DuoH.WangT.-YuCaiP.-L.ZhangY.DengK.-J.et al (2024)

This process might also enhance Schwann cells to properly interact with neural cells, to help form protective myelin sheaths around neuronal extensions, and to ensure proper signal transmission [42]