Our own vitamin poll had over 50% of parents giving their kids a daily multivitamin. Unfortunately, the AAP also says that "the vitamin supplements available in pills are incomplete," so giving a vitamin may not even be helping the kids who actually need a supplement to their diet.
Background
Wrong! The average 'complete' multivitamin only has about 6 to 10% of a child's daily requirement for calcium. Without further supplements, these children may have problems caused by this calcium deficiency in thier diet.

