do b12 injections work How Fast Does a Vitamin Shot Work? The Truth About B12 Injections:

Other ways to raise your B12 If injections are not right for you, there are other options: oral B12 tablets or sublingual drops, more B12-rich foods like fish, eggs, and fortified cereals, or a full weight loss program that combines nutrition, activity, and medical oversight

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Possible B12 Injection Contraindications There are several potential contraindications or reasons not to receive treatment with B12 injections

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The injection delivers Vitamin B12 directly into the body without requiring a full IV drip appointment

Side effects of injectable B12 may include such gastrointestinal symptoms as nausea, vomiting, mild diarrhea, headache and dizziness, skin rash, and itching (presumably, related to skin rash)