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[6] [3] [10] A mild deficiency may not cause any discernible symptoms, but moderate deficiency can cause various symptoms, such as feeling tired, lightheadedness, headaches, cold intolerance, pale skin, sore tongue, upset stomach, loss of appetite, hair and skin color changes, numbness or tingling (pins and needles) of the fingers and toes, and tinnitus, and vision, cognitive or psychological problems

Enzymatic activation and inhibition research, offering insights into biochemical cascade behavior

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Frost-free freezers are also not ideal because their automatic defrost cycles cause temperature fluctuations

Together, they support cognitive performance, alleviate stress, and enhance overall brain health

Vitamin D levels were also lower in people with metabolic syndrome