Currently, the problem of improving sports performance and increasing professional longevity is relevant, which is directly related to the indicators of physical performance and the prevention of diseases, including those of the musculoskeletal system that are common in athletes. Intense loads and muscle fatigue lead to a constant overstrain and increase the risk of injury and the development of diseases of the musculoskeletal system in this professional group. The balance of calcium and phosphorus in the body is essential for ensuring the normal structure and function of the musculoskeletal system, and vitamin D plays a primary role in maintaining this balance. Recent studies aimed at researching the availability of vitamin D for athletes often reveal insufficiency and defi ciency of this vitamin. It is known that the main source of vitamin D is its formation in the skin by ultraviolet radiation; it is proved that even with prolonged and intense sunlight there is no overproduction, and therefore, no toxic eff ects associated with hypervitaminosis D. However, the effect of UV rays on the human body can lead to the development of skin malignancies, therefore, the use of sunscreens is necessary during insolation.

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