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Individuals looking to increase their B12 levels to boost energy or immune function may be wondering, How quickly does a B12 shot work? Ultimately, this can depend on a number of factors, such as your current B12 intake and how effectively your body can process B12
The average diet supplies about 5 to 15 mcg/day of vitamin B 12 in a protein-bound form that is available for absorption after normal digestion
However, absorption requires intrinsic factor, a protein produced in the stomach
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