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The 20mg and 30mg vials offer the best value per milligram and are appropriate for extended research programs requiring consistent dosing over multiple weeks
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While B complex vitamins are generally considered safe, high doses can cause side effects
Insurance coverage for vitamin B12 injections typically depends upon medical necessity and your individual insurance policy
Other reported effects include: Headaches and dizziness Nausea and gastrointestinal discomfort Allergic reactions to B12 formulations (rare) If you experience symptoms suggesting a severe allergic reaction (difficulty breathing, severe rash, swelling of face/throat), seek emergency medical attention immediately by calling 999 or attending A&E
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