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Description
Certain groupssuch as older adults, vegetarians, individuals with gastrointestinal disorders, and those taking specific medications (e.g., metformin or proton pump inhibitors)may develop a B12 deficiency

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ClinicalTrials.gov (2020)

With an estimated 20% of UK vegetarians having low B12, the need for proactive testing is greater than ever
The functions of vitamin B and its deficiency related outcomes are indicated in Table 1
