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Goodman says, though some people require them for the long term. Your healthcare provider will make recommendations based on your B12 level, age, diet and overall health
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For those receiving B12 injections, energy levels and mental clarity typically improve within 24 to 72 hours
You wake up with more energy, less fatigue, and better focus
Steadier levels: Early on, you might feel a boost that fades before the next dose
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