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Vegetarians and vegans are at increased risk for vitamin B12 deficiency, since the vitamin mainly comes from animal-based foods (or supplements)
additionally, a domain-specific assessment using the Cochrane Risk of Bias Tool (RoB 2) was also conducted and reported in Table 3 to provide a comprehensive appraisal
B12 injections are also used to treat people with malabsorption (gastrointestinal conditions that prevent proper absorption of B12 from the gut), for example, people with atrophic gastritis (stomach inflammation) and intrinsic factor deficiency (pernicious anemia) or those who have undergone surgical procedures such as gastrectomy or small bowel resection (stomach or intestine removed), autoimmune diseases, etc
39 van Asselt, D
