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Side Effects and Safety B12 injections are generally considered safe for most people, and most individuals tolerate B12 injections well, with mild side effects being occasional rather than typical

These include: Allergic reactions, such as hives or trouble breathing Heart problems in people with heart issues Drug Interactions and Contraindications Vitamin B12 shots can affect how some medicines work or have special warnings

What they did: Characterization of AOD-9604 in isolated rat adipocytes

Munk MR, Valter K

Oral Supplements Injections act faster and are more reliable in people with absorption issues, while oral supplements can be effective in mild deficiency