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In most cases, the medical professional will examine both arms to see if there is a vein that appears prominent
Populations at a higher risk of vitamin B12 deficiency include people who are vegetarian or vegan, exclusively breastfed infants of vegan women, older adults, those with gastrointestinal disorders or who have had gastrointestinal surgery, and people with an autoimmune condition known as pernicious anemia
If a lab report shows high B12 levels, the most likely explanation is also the most reassuring one: vitamin B12 is going into your body from outside
Side effects are rare but can include mild soreness at the injection site
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