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Vitamin B12 is obtained through food sources such as beef, liver, chicken, fish (trout, salmon, tuna, clams), fortified breakfast cereals, lowfat dairy products, and eggs
poor nutrition or vegan diet) Transcobalamin II deficiency It is also used as part of the vitamin B12 absorption test (Schilling test)
Future trials should also measure important outcomes such as the clinical signs and symptoms of vitamin B 12 deficiency, health related-quality of life, socioeconomic effects, and report adverse events adequately, preferably in a primary care setting. Clinical practice guidelines British Columbia Medical Services Commission (MSC)
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