does a b12 injection make you tired I Feel All the Time. Do I Need Shot?: Shawn Veiseh, M.D.: Family Medicine How Quickly Does a B12

High-dose oral therapy (10002000 micrograms daily) can be effective even in pernicious anaemia, as approximately 1% of B12 is absorbed through passive diffusion independent of intrinsic factor

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A deficiency in vitamin B12 can lead to symptoms such as fatigue, brain fog, irritability, tingling sensations in the extremities, and even depression

Seniors are also more vulnerable as their body cant assimilate vitamin B12 well, due to a reduction in gastric acid in the intestines