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doi:10.1001/archpedi.160.9.933
How Quickly They Work The effects of a vitamin B12 injection are usually felt within days to weeks
This is completely normal and often helps facilitate a slow, controlled transfer of the diluent
Because your skeletal muscles are filled with mitochondria (the portion of your cell responsible for energy production in your body) and we know that B12 directly acts in these mitochondria
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