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However, it would appear this is the case only in one very specific circumstance: That is, when doctor-prescribed vitamin B-12 is administered to treat pernicious anemia (via Pernicious Anemia Relief)

However, for othersparticularly those with a more severe deficiency or underlying health conditionsit may take up to a week or even several weeks to experience significant changes

Medicare Part B covers J3301 when it is medically necessary and properly documented with: Correct units NDC number Administration CPT code Valid ICD-10 diagnosis 7

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The parietal cells of the stomach secrete a glycoprotein called intrinsic factor, which takes B12 from the R-factor and carries it to the last part of your intestine, called the ileum, for absorption of B12

That quick response is one reason injections are often recommended for people with ongoing fatigue or confirmed deficiency