What to watch with Vitamin D 25-OH and Sport?

When combining Vitamin D (25-OH) testing with sports, caution and context are key. Vitamin D supports bone density, muscle function, and immune regulation – all critical for athletic performance and recovery. However, the provided context contains no direct studies or guidelines on Vitamin D and sport. The evidence for routine supplementation based solely on a 25-OH test is weak; most support comes from mechanistic or observational data. Individual factors like sun exposure, skin type, genetics (e.g., VDR polymorphisms), and training load can alter requirements. Excess Vitamin D (>100 ng/ml) carries toxicity risks. Therefore, a 25-OH test can serve as a screening tool, but it should not replace medical advice. No single biomarker can capture the full complexity of Vitamin D metabolism. Evidence: unclear due to lack of context.