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The biggest difference is bioavailability , which is how much of the vitamin enters your bloodstream
There are different ways to give B12 shots, each with its own good points and things to think about
Intramuscular injections of B12 are administered during the first stage of the test, an hour after the patient takes an oral dose of radiolabeled vitamin B12
This is likely placebo effect or vasodilation response, as tissue B12 saturation requires 24-48 hours
But what happens when you take too much vitamin B12
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