b12 pills vs b12 injections Vitamin vs. Supplements: Which Works Best? B12 - Boost energy +

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

Precautions Use the lowest effective dose to control the condition being treated

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Vitamin B12 is found mostly in animal products, like fish, meat, dairy and eggs