Data from a Swedish birth cohort study involving 2,423 children appeared in the American Journal of Clinical Nutrition (Dec 2009; 90: 1693 – 1698). It found an association between early multivitamin supplementation and a decrease in allergies. While the study did not show that current use of multivitamin supplements lowered the risk of allergies, it did show that taking a multivitamin before the age of four lowered the risk of developing allergies.