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Key Takeaways B vitamins function as essential coenzymes in cellular energy metabolism — they help convert food into ATP but do not directly provide energy themselves. The evidence for B-complex supplementation improving energy and reducing fatigue is strongest in people...

Key Takeaways The most comprehensive meta-analysis to date, covering 49 randomized controlled trials and over 61,000 participants, found no statistically significant reduction in respiratory infections from vitamin D supplementation across the general population. Subgroup analysis suggests daily low-dose supplementation (400–1,000...