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