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(November 2007)
An open question with no conclusive answers seemingly not on the horizon
While it depends on individual metabolism and the frequency of these injections, usually, they tend to last about a week or two in your system
When you take vitamins orally, your digestive system has to break them down, and only a fraction actually makes it into your bloodstream
A vitamin B12 shot is a vitamin injection that may be prescribed by your doctor to help treat a vitamin B12 deficiency
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