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Common places to inject include the deltoid, vastus lateralis, and gluteal muscles
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
it only changes how much liquid you have to inject to get your dose
Masnec S, Kokot A, Zlatar M, Kalauz M, Kunjko K, Radic B, et al
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