doi:10.1007/s00109-016-1488-y Chang CH, Tsai WC, Lin MS, Hsu YH, Pang JHS
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Self-administered B12 shots are generally recommended for individuals: whose bloodwork has documented low B12 levels Patients with pernicious anemia or a lack of intrinsic factor Individuals with Crohn's disease, celiac disease, or post-bariatric surgery malabsorption Vegans and strict vegetarians are unable to correct the deficiency through diet Older adults whose stomach acid production has declined with age Anyone on long-term metformin or proton pump inhibitors Across most of the U.S., injectable B12 is not sold over the counter a clinician has to write the script before a pharmacy can dispense it
However, there is a low risk of vitamin B12 toxicity because the body only utilizes what it needs and eliminates the excess
B12 therapy requires the same kind of regular check-ins to stay effective
