Vitamin D or plays a very important role in calcium balance and bone mineralization. Thus it contributes to normal absorption and utilization of calcium (and phosphorus), which contributes to a normal calcium level in the blood and the maintenance of normal bones and teeth.
The role of vitamin D in the immune system and muscles is also important. It contributes to a normal immune system and the protection of cells from oxidative stress as well as to normal muscle function. Vitamin D also has a function in cell division, a basic condition for the formation of new muscle cells and consequently muscle building.
In addition to the endogenous synthesis from solar radiation, vitamin D can also be supplied via foods such as high-fat fish. In many countries - unfortunately, less so in Europe - vitamin D is also added to foods such as milk in order to meet the needs of the population and minimize deficiency symptoms.