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Using an injection allows your body 100% absorption verses forcing the digestive system to absorb and deal with the potential adverse side effect
When you take Vitamin B12 through an intramuscular injection, you can process 100% of that vitamin, whereas with an oral supplement, usually only about 50-70% of the vitamin is able to be processed and metabolized
This effect goes via NO-mediated and cholinergic mechanisms (Kokot et al., 2016), which were accepted as key in ophthalmic arterial dilatation (Osborne et al., 2004)
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