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For a comprehensive list, you can explore our guide on what foods contain vitamin B12

Other symptoms to follow are headache, face swelling, shortness of breath, a tendency to vomit etc

Rosario Ligresti As highlighted in this paper, in the gastrointestinal tract this depends on two functioning systems: the microbiome and adequate levels of vitamin B12, he added

In contrast, oral vitamin B12 supplements need to pass through your stomach acid and digestive system, and their absorption can be less reliable, especially if there are absorption issues

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