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- Everyone, especially runners, needs vitamin D. It’s a key nutrient linked to a host of health and performance-related outcomes, including bone and muscle health, anti-inflammation, and heart health. Research has also suggested that vitamin D has the potential to optimize athletic performance. Boost Endurance Studies have shown that vitamin D may increase maximal oxygen uptake (VO2max), which is an indicator for endurance capacity. This could mean having proper vitamin D stores can lead to more successful long runs. Enhance Muscle... [read more]