b12 injection and flu vaccine Why Am I So Tired? How Injections Can Restore Your Energy Focus: Shawn Veiseh, M.D.: Family Medicine Recent Court Decision Has Established

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

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

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Have difficulty absorbing B12 through food or supplements

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