Micronutrient evidence brief
Vitamin D is a hormone-like vitamin involved in bone, muscle, immune, and calcium regulation. It matters most when sunlight exposure or blood levels are low.
Correcting low vitamin D status may support musculoskeletal health; performance gains in athletes are inconsistent.
2023 athlete meta-analysis: no statistically significant maximum-strength or power improvement overall.
Best guided by 25(OH)D testing, diet, sun exposure, body size, and clinician advice for high-dose use.
Not a general strength booster for users who are already vitamin-D replete.
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