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It could point to several things: A different cause: your fatigue might stem from thyroid problems, iron deficiency, or sleep apnea rather than B12
When a significant B12 deficiency is corrected, your bone marrow suddenly starts making large numbers of new red blood cells, and that process pulls potassium out of the blood
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High-performance living demands focus and energy
Research suggests this dual action creates cellular conditions that favor energy expenditure over energy storage, giving researchers a tool to study metabolic switching mechanisms
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