Add to ORKG<em>This lecture shows basic conception of problem of vitamin deficiency in schoolchildren at the time of increased educational load (intellectual and physical). It’s marked, that children taking vitamin complexes have optimal concentration of vitamins in blood plasma. All vitamins in vitamin complexes are similar to “natural” ones, presenting in natural food with its chemical structure and biological activity. Opinion that pharmaceutically made vitamins are less assimilated then “natural” is mistaken. Administration of vitamins in complex is more effective then separate use of each of them. As a result, prophylactic use of vitamins strengthens protective forces of child’s organism, favors to normal functioning of nervous system of schoolch...