fom the Washington Post:

A study analyzed data on 6,590 people …

“Among the youths, food and environmental allergies were greater in those with lower levels of Vitamin D. Young people deficient in Vitamin D were about twice as likely as those with higher levels of the nutrient to have peanut or ragweed allergies and nearly five times as likely to be allergic to oak. …..  In adults, however, no link was found between Vitamin D levels and allergen sensitivity.”