vitamin b12 injection vs sublingual Efficacy of oral compared with intramuscular B-12 supplementation after Roux-en-Y gastric bypass: a randomized controlled trial Vitamin B12 Injections vs. Supplements:
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[1] Most often for at-home therapy, it will be IM injections

How often B12 shot should I get
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Shortness of breath and dizziness: Difficulty breathing and a feeling of lightheadedness

Free B12 then binds to R-proteins secreted by salivary glands

Some of the wording suggests that this is an immediate effect and that is not something have come across