Vitamins are a type of biological molecules that our body needs in small amounts.

Different types of vitamins are divided into two groups: water-soluble (C and B-complex) and fat-soluble (A, D, E, and K) vitamins.

The most of vitamins function as coenzymes.

They are involved in thousand metabolic reactions and essential for a normal physiologic functioning of the human body.

Inadequate vitamin intakes can cause specific disorders.

There are reference values such as recommended dietary allowance (RDA), adequate intake (AI) and tolerable upper intake level (UL) to plan and assess vitamins intakes of healthy people.