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de Weers M, Tai YT, van der Veer MS, Bakker JM, Vink T, Jacobs DC, et al

The Guangdong Provincial Covid-19 Pandemic Control Research Fund (2020KZDZX1220)

NTvG 2002;146: 459-64 5

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

Most people get enough vitamin B12 from their diet, but some people have a deficiency