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4,5 Dietary insufficiency, pernicious anemia (i.e., an autoimmune process that reduces available intrinsic factor and subsequent absorption of vitamin B 12 1,2,6,7 ), and long-term use of metformin or acid-suppressing medications have been implicated in B 12 deficiency
B12 injections are necessary to maintain healthy levels of this essential nutrient
Its high risk and often doesnt work
[9] [5] It is given by mouth, by injection into a muscle, or as a nasal spray
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