Chronic fatigue is thought to affect more than 3 million people in the United States alone. Experts are unsure what causes it, but it may occur after a viral infection or major physical stressor. Now, a study has found that deficiencies in vitamin B12 and folate (vitamin B9) are linked to physical and mental fatigue, so may be a factor in chronic fatigue. The researchers suggest that, while their study cannot prove causation, maintaining adequat…
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