Vitamin D3 is produced by the photolytic action of ultraviolet radiation on the skin. Despite the fact that every body can produce vitamin D3, contemporary lifestyle and insufficient exposure to sunlight, results in poverty vitamin D3, which must necessarily be taken through food, and its role in maintaining the body in good condition is important.

Vitamin D3 has an essential role in maintaining the homeostasis of calcium and phosphorus and, therefore, in maintaining the health of bones and teeth. Moreover vitamin D3 is involved in tissue metabolism and the presence in sufficient quantities, is essential for the differentiation of cells and maintaining the functionality of the membranes and for the functioning of various organs such as skin, muscle, pancreas, nerves, parathyroid gland and the immune system.