Injectable vitamin B12, which can treat significant deficiencies, may cause the following common side effects: More serious side effects of vitamin B12 injections can include: irregular heartbeat heart palpitations hives or a skin rash Vitamin B12 can cause very rare but serious allergic reactions, or anaphylaxis
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But not instantly it takes some time to build back up the B12 that was missing
[DOI] [PubMed] [Google Scholar] 39.Boozer CN, Leibel RL, Love RJ, Cha MC, Aronne LJ
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Blood tests help confirm deficiency, monitor the effectiveness of injections, and prevent unnecessary overuse