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1 2 Professional guide to diseases (9 ed.)
What does getting a B12 injection actually feel like
Vitamin and Mineral Requirements in Human Nutrition (2nd ed.)
B12 absorption occurs primarily in the terminal ileum via intrinsic factor-mediated uptake, with approximately 1% absorbed through passive diffusion at high doses
What we care about most, though, are interventional studies, where people are randomized to B12 so we can see what happens
It is commonly administered as an intramuscular injection, especially when a deficiency is severe or caused by absorption issues
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