Swedish researchers found that by giving a daily multivitamin to kids starting at age 4 may help them avoid certain food and seasonal allergies.
After questioning the parents of 2,423 8-year old children about their history of allergies and asthma, those who started taking a vitamin before or around age 4 were less likely to be sensitive to food or inhaled allergens.
More reading at "Do multivitamins curb kids' allergy risk", Reuters Health