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You get vitamin B12 in your diet primarily by eating animal products and fortified foods

Note that every evidence entry refers to preclinical data

Influences of vitamin B12 supplementation on cognition and homocysteine in patients with vitamin B12 deficiency and cognitive impairment

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High-risk groups who should be considered for monitoring include: Patients taking metformin for more than three years Those on high-dose metformin (2g daily) Older adults (aged 65 years and above), who have reduced gastric acid production and lower B12 stores Patients with pre-existing risk factors for B12 deficiency, including previous gastric surgery, pernicious anaemia, or inflammatory bowel disease Individuals following vegan or vegetarian diets with limited dietary B12 intake Those taking acid-suppressing medications (proton pump inhibitors or H2-receptor antagonists) Patients with symptoms suggestive of B12 deficiency Patients with unexplained anaemia or neuropathy The frequency of monitoring should be guided by clinical judgement and local pathways, with consideration of individual risk factors