Vitamins are essential nutrients for humans. They are organic substances that are vital for important functions in our metabolism and are indispensable for building and maintaining our body. Moreover, vitamins contribute to our well-being. Since our body cannot produce vitamins itself (except for vitamin D and vitamin K2 in small quantities) they must be supplied regularly with food.
Each vitamin has its own functions that cannot be carried out by other vitamins, or only to a limited extent. The total of 13 vitamins are divided into water-soluble and fat-soluble vitamins. The fat-soluble vitamins A, D, E and K can be stored in large quantities in the liver and fatty tissue and released when needed. Water-soluble vitamins are mostly precursors of enzymes and are absorbed in the small intestine. They cannot be stored (except for vitamin B12), or only to a limited extent, and must therefore be supplied regularly.
Pregnant women, nursing mothers, infants and elderly people have a particularly high need for vitamins.