b12 injection and flu vaccine Why Am I So Tired? How Injections Can Restore Your Energy Focus: Shawn Veiseh, M.D.: Family Medicine Vitamin B12 Injections: What You

It can be corrected simply with oral vitamin B 12 supplement since free vitamin B 12 absorption is not affected.31 Any process that interferes with the release of free vitamin B 12 , such as decreased production of gastric acid and pepsin for releasing vitamin B 12 from food, and impaired secretion of pancreatic enzyme for releasing vitamin B 12 from vitamin B 12 -R-protein complex, can lead to malabsorption

In these patients, serum cobalamin concentration may be within the reference range or even exceed B12, despite the occurrence of characteristic, mainly neurological, symptoms of vitamin B12 deficiency [5]

PMID 16537422

Once youve received a shot, the effects can last anywhere from a few days to a few weeks

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Side effects and cautions B12 has no established upper limit due to low toxicity, but injections can have side effects: Common: soreness, redness or swelling at the injection site