Giving a daily multivitamin to kids starting at age 4 may help them avoid certain food and seasonal allergies, a new study suggests. Swedish researchers questioned the parents of 2,423 8-year old children about their history of allergies and asthma. They found that those who started taking multivitamins between the ages of 5 and 8 were not less likely to be allergic, but those who started taking a vitamin before or around age 4 were less likely to be sensitive to food or inhaled allergens.