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Best Vitamin B12 Supplements Vitamin B12 supplements can be given either by injection or as an oral tablet

It is also advisable to inform your healthcare provider about any existing medical conditions or other medications you are taking to prevent potential interactions

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Risks and Side Effects While generally safe, vitamin B12 injections can have side effects or risks, such as: Mild pain, swelling, or redness at the injection site Dizziness, headache, or nausea Allergic reactions (rare) Hypokalemia (low potassium levels) in individuals with severe deficiency undergoing treatment People with allergies to cobalt or who have Lebers disease should avoid B12 injections unless specifically advised by a doctor