It is a group of vitamins (D¹, D², D³). They are indispensable for maintaining and mobilizing calcium and phosphorus in the body. They make strong and well shaped teeth and are an integral part of bones. Its deficiency causes rickets and is a predisposing cause of dental caries. They are produced in the body by the action of the sun's ultraviolet rays on the skin, where ergosterol, a provitamin D.
The source of choice for vitamin D is, where possible, exposure to sunlight in countries with a cold or temperate climate, it is advisable to use fortified foods or fortified with vitamin D, such as milk, etc.