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Vitamin B12 is a water-soluble injection that plays important roles in numerous body systems

T3 (the active thyroid hormone) production can decrease during prolonged dieting as a metabolic adaptation

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[It] also aids in DNA synthesis and is involved in the metabolism of carbohydrates, fats, and proteins." Because it's so important, those with this type of vitamin deficiency, which is diagnosed via a blood test, are usually recommended to take either supplements or get regular B12 shots