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Your doctor can check how much B12 is in your body, but not all of it may be useable

Its main area of interest is fat metabolism

Oral may make sense for a gut-first goal, while injections may be discussed for more body-wide goals

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

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