Which Vitamin for Lethargy? A Guide to Nutritional Causes of Fatigue
                                
                                
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                                    4 min read                                
                            
                                According to the Cleveland Clinic, about 35% of adults in the United States have a vitamin D deficiency, a common nutritional issue linked to fatigue. To understand **which vitamin for lethargy** might be relevant for your symptoms, it's crucial to explore the key nutrients involved in the body's energy production.