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Oral B12 supplementation: High-dose oral cyanocobalamin (10002000 micrograms daily) represents an alternative for patients with dietary deficiency or those without severe deficiency or neurological symptoms, and for those unable or unwilling to receive injections

Poor sleep, inadequate nutrition, excessive sun exposure, and chronic stress all limit results regardless of dosing optimization

Additionally, vitamin B 12 deficiency can also occur as a result of other malabsorptive conditions (such as inflammatory bowel disease, or pancreatic insufficiency), after certain procedures (such as bariatric surgery, or ileal resection), restricted diets (such as veganism), or the use of certain medications (such as metformin or proton-pump inhibitors)

It is one of the non-bariatric risk factors for vitamin B12 deficiency that I sometimes find in patients

I did not have Covid, to my knowledge

The FDA does not review compounded medications for safety, effectiveness, or manufacturing quality prior to distribution