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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
metabolism, cellular methylation, mitochondrial physiology, energy regulation, and metabolic signaling
It is not FDA-approved, is research-use-only, and is not for human consumption
Knowing how Vitamin B12 helps adults shows the need for the right amount and how to take it
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