06/12/2026
You might! Vitamin D deficiency is one of the most common nutrient deficiencies (up to 70% of athletes may have insufficient levels!).
You may be at higher risk if you:
• Train and/or work indoors
• Train early morning or late evening when UV is low
• Have darker skin pigmentation
• Live at northern latitudes
• Consistently wear sunscreen or covering clothing
Why does it matter?
Vitamin D plays key roles in:
- Bone health & reduced stress fracture risk
- Muscle function & neuromuscular performance
- Inflammation reduction & recovery
- Immune system support
So if you’re deficient, you face a higher risk of stress fractures and respiratory infections, slower recovery from injury, greater inflammation, and compromised muscle function. In short: deficiency negatively affects your health AND can sideline your season.
While you can get vitamin D from a few food sources (fatty fish, egg yolks, UV-exposed mushrooms, and fortified foods), diet alone usually isn’t enough to fix a deficiency. Your body can make vitamin D from sunlight, but many athletes don’t get adequate sun exposure.
What should you do?
- Talk to your doctor about getting your 25(OH)D level checked, especially if you have any of the risk factors mentioned above.
- If you’re deficient, work with your dietitian on a supplementation plan (vitamin D3 is preferred!).
- Take your supplement with a meal that has fat for better absorption.
- Once your levels are sufficient, a maintenance dose may be needed to keep you there (2,000 IU/day is generally safe and effective)
NOTE: This isn’t a “more is better” situation. Because vitamin D is fat-soluble, your body stores it rather than flushing out the excess. That means taking too much for too long without monitoring can actually cause problems. But too little won’t fix a deficiency.
The right dose depends on YOUR levels, YOUR risk factors, and YOUR goals. The only way to know where you stand is a simple blood test.🩸 Get tested and get a plan. Don’t guess!
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-health