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People with B12 levels below 200 pg/mL are called B12 deficient and are likely to have symptoms - this could be due to medicines, strict vegetarian diets, or medical conditions
While low serum cobalamin levels do not necessarily imply deficiency, an abnormally high serum cobalamin level forms a warning sign requiring exclusion of a number of serious underlying pathologies
Allergies and Health Conditions People with allergies or certain health problems should let their doctor know before getting a vitamin B12 shot
Presented for research literature review only Fishel SB et al
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