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A deficiency can lead to fatigue, cognitive decline, and weakened immunity
Gut 1978;19:1105-9
Nor does short-term oral exposure evidence establish the safety of other routes, formulations, long-term repeated exposure, or independently manufactured materials
Maintenance phase: Once your levels are healthy and symptoms improve, we move to a maintenance schedule, which might be a monthly shot or a return to high-dose oral supplements if your absorption allows
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