… are vital substances that the body cannot produce on its own. Therefore one needs to eat a healthy and varied diet so that they are constantly provided. Different vitamins have specific functions in the body. For example, they influence the conversion of food into energy, the building of body cells, supporting the immune system, the formation of hormones, the detoxification of the body and the support of enzymes. Vitamins E, D, K and A are fat-soluble vitamins. All other vitamins are water soluble.
Metabolic Balance Blog 