how long does it take a b12 injection to work Fast Vitamin Shot Work? How Long Does It Take

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They will look at your medical history and might do some tests

Vitamin B12 is essential for energy production, brain function, red blood cell formation, and nerve health

The withdrawal of corticosteroids after prolonged therapy may result in symptoms of the corticosteroid withdrawal syndrome consisting of fever, myalgia, arthralgia and malaise

However, protocols extending beyond 6 months in humans rely on extrapolation rather than controlled studies

Because of this and the fact that the body only needs a small amount of vitamin B12 each day, it can take up to a year or even longer for an inadequate vitamin B12 to manifest as an apparent deficiency