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B12 Side Effects in Elderly: Safety Guide for Older Adults Vitamin B12 supplementation is commonly prescribed for elderly patients, as deficiency becomes increasingly prevalent with age due to reduced gastric acid production, pernicious anaemia, and medication interactions

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doi: 10.1016/j.actbio.2023.07.019

Unexpectedly elevated B12 levels without supplementation may indicate liver disease, renal impairment, or myeloproliferative disorders requiring investigation