Low Vitamin D and Injury Risk in Athletes: What a New Collegiate Study Found
A new 2026 study of collegiate athletes adds hard numbers to a link sports medicine researchers have suspected for years: low vitamin D status doesn't just affect bone health in the abstract — it tracks with real injury risk on the field.
What the study found
Researchers measured serum 25-hydroxyvitamin D [25(OH)D] levels in collegiate athletes and followed them for musculoskeletal injuries over a competitive season. For every 5 ng/mL drop in vitamin D status, the odds of sustaining a musculoskeletal injury rose by 13%. Athletes with clinically low levels — common in indoor sports and during winter training blocks — carried a meaningfully higher injury burden than teammates with sufficient status.
Why vitamin D matters beyond bone
- Supports calcium absorption and bone mineral density, reducing stress-fracture risk
- Plays a role in skeletal muscle protein synthesis and neuromuscular function
- Modulates immune function, which affects illness-related training interruptions
- May support post-exercise recovery and inflammation regulation
A companion 2026 narrative review on vitamin D in athletes echoes these findings, noting that deficiency is widespread among indoor-sport and travel-heavy athletes, particularly during winter months when sun exposure drops. Elite-athlete supplementation trials suggest the clearest performance benefits show up in aerobic endurance, anaerobic power, and strength — though researchers caution that evidence directly linking supplementation to lower injury rates is still developing and shouldn't be oversold.
What this means for your training
Most sports medicine guidance targets a serum 25(OH)D level above 30 ng/mL (75 nmol/L), with levels below 20 ng/mL considered deficient. If you train mostly indoors, live at higher latitudes, or are heading into winter with limited sun exposure, a simple blood test — not guesswork — is the most reliable way to know where you stand before considering supplementation.
Helpful products
- Vitamin D3 5,000 IU softgels — a common at-home option once you know your baseline blood level.
- At-home 25(OH)D test kit — check your status before starting supplementation.
Source: Frank et al., Sports Health (2026) / Quality in Sport narrative review (2026)
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