A vitamin complex is a preparation containing vitamins in combination selected for the treatment and prevention of certain diseases. Many vitamins affect the health and development of the human body. There are fat-soluble and water-soluble vitamins. Let's look at why the main ones are needed: fat-soluble vitamins are called retinol, calciferol (D), tocopherols (E), cholecalciferol (A, D2, D3) and phylloquinones (K); soluble in water - carotenes (A), ascorbic acid (C), rutin (P).