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During gastric bypass surgery, surgical staples are used to create a small pouch in the top part of the stomach

However, pernicious anemia, in which the body is unable to properly absorb B12, affects some people

Only publications focusing on vitamin B 12 relative to COVID-19 prognosis, other viral infections, and diseases with similar symptoms were eligible for inclusion

Vitamin B12 is water-soluble, so excess amounts are generally excreted in the urine

Although methylcobalamin and adenosylcobalamin are the bioactive forms of B12, they are unfortunately very chemically unstable outside of the body mainly due to their photosensitivity and therefore more difficult to produce