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B12 is necessary for the brain, nerves, blood cells, and other body parts to work
It is shallow, so the needle only travels a short distance, and it has fewer pain-sensitive nerves than deeper tissue, so most people feel a small pinch rather than a deep ache
It is involved in energy production and through different metabolic and anabolic cycles in development of amino acids, blood cells, vitamin D3 and other fatty acids
Rapid injection can cause discomfort and may contribute to localized reactions
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