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B12 is an essential nutrient, and its deficiency is common, especially among individuals following restricted diets like vegetarianism or veganism, pregnant or breastfeeding women, older adults, those who have undergone gastrointestinal surgery or have gastrointestinal disorders, and people with an autoimmune condition known as pernicious anaemia
[4] Clinical practice typically involves reviewing medication history, assessing liver function, performing a full blood count, and considering haematological or hepatological referral when levels are markedly elevated without clear cause
2019 Jan;22(1):E45-E52
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