Vitamin D Supplementation and Athletic Performance
5 days ago
4 min read
Vitamin D is a hormone more than a vitamin: made in skin under sunlight, acting through a receptor found in muscle, regulating calcium and muscle-cell growth. Athletes train indoors, train early and late, and cover up - so they test low at rates that surprise their doctors. The prevalence problem is real. Whether fixing it changes performance is where the evidence thins.
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