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GIP (glucose-dependent insulinotropic polypeptide) influences energy homeostasis at a systemic level, and its activation can modulate serotonin and melatonin productionboth essential for healthy sleep
Vitamin B12, unlike other Vitamin B members, is stored in the liver in significant amounts and is primarily found in animal-based foods
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It makes B12 a less likely cause and points you toward the next one, often thyroid function, which causes the same kind of washed-out fatigue
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