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One potential cause of persistent tiredness is a deficiency in vitamin B12, an essential nutrient that plays a vital role in your health
In fact, low B12 levels can cause discolouration of nails, brittle hair, dry lips and mouth and even hyperpigmentation
Fourth, the current work does not account for the heterogeneity of the studied populations, including differences in genetic background, comorbidities, lifestyle factors, and environmental exposures, which may significantly influence both pathophysiology and clinical presentation
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