Iron and vitamins for children In times of great intellectual challenges, iron contributes to normal cognitive function. During the growth phases, more iron is required for the formation of cells in general, hormones, enzymes and for increasing blood volume. Insufficient iron levels seen in children and young adolescents are due to stages of intense growth. Girls, in their adolescent phase, may have a greater need for iron due to the onset of menstruation. How to use Take once a day half an hour before a meal. Children from 3 to 6 years: 10 ml Children from 7 to 9 years: 15 ml Boys from 10 to 12 years old: 17.5 ml Girls from 10 to 12 years old: 20 ml Youth from 12 years and adults: 20 ml Do not exceed the recommended daily dose.