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The speed of response depends on factors including the severity and duration of deficiency, the presence of neurological complications, and individual metabolic differences
For those receiving B12 injections, energy levels and mental clarity typically improve within 24 to 72 hours
Hair, skin, and nails: B12 supports cell reproduction, so hair, skin, and nail health can suffer when levels are low
As levels rise, these symptoms can improve within a few days or weeks
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