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It acts as a key regulator for many bodily processes
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B12 injection shots can usually be felt within 24 hours (and a change should show in blood tests after a month or two) A high dose of B12 oral supplementation takes the same time as an injection: roughly 24 hours to feel an improvement and then up to 2 months to show in blood markers
Economic Analysis Method Patients and Databases Population-based administrative databases for Ontario were used to identify patients receiving vitamin B12 (cobalamin) intramuscular injections in any fiscal year between 2006 and 2011
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