A B12 injection may help initiate your cells to go into overdrive and produce more energy for your body to use
However, due to rare but serious adverse effects (e.g., thrombocytopenia, cardiac arrhythmias, hypersensitivity reactions), many guidelines recommend against routine use
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Summary Vitamin B12 injections are very safe
That being said, it may cause severe side effects if an allergy is present or if the individual is also taking certain medications
Using a sterile syringe, draw 6mL of BAC water for reconstitution