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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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Because B12 helps your body produce red blood cells, it can affect both how you feel and how you look

Brand: Meitheal Pharmaceutical

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