Vitamin D is a fat-soluble vitamin and assessed by measuring serum 25-hydroxyvitamin D [25(OH)D] concentrations. Widely known for its role in healthy bone metabolism, Vitamin D enhances intestinal calcium and phosphorus absorption to enable normal bone mineralization. Studies have shown that adequate vitamin D levels are important for enhancing bone strength and density. Among its other health functions, vitamin D plays a critical role in the musculoskeletal system, as vitamin D sufficiency is correlated with optimal muscle function. Several clinical studies have shown that supplementation with vitamin D improves muscle strength and may enhance physical performance, suggesting a beneficial use for athletes. Additionally, studies have shown a positive correlation between maximal oxygen uptake (VO2 max) and serum 25(OH)D concentrations, which may enhance physical activity. Vitamin D may also decrease post-exercise recovery time by increasing cellular matrix proteins, which are critical for skeletal muscle repair.
Besides musculoskeletal support, vitamin D has many other roles in the body, including modulation of cell growth and cell signaling, metabolic health, cognitive/mood support, and immune health.
