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The NIH Vitamin B12 Fact Sheet for Health Professionals notes that oral supplementation is appropriate for many patients who do not have intrinsic factor deficiency

According to the American Autoimmune Related Diseases Association, symptoms of pernicious anemia in adults typically do not begin to show until after age 30

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Fraternale et al., 2017), as well as conferring protection against oxidative stress caused by microbial, parasitic and viral infections such as SARS-CoV-2 that causes COVID-19 disease (Morris et al., 2013

eradication treatment with antibiotics and proton-pump-inhibitors 11,13

How is the research typically conducted
