Researchers who say vitamin C is helpful for asthma point out that other nutrient with similar antioxidant properties could be beneficial. These nutri­ents include vitamin E, selenium, and beta-carotene, a yellow pigment found in carrots, cantaloupe, and other fruits and vegetables. Laboratory work indi­cates that all three help reduce inflammation-producing biochemicals.

“So far, however, all we have are primarily case-control studies,” said doctor. Those studies that looked at actual supplementation with micronu­trients or vitamins did not show significant improvement of lung function, with the exception of one study, according to professional nutritionist. In that study, people with asthma who took 100 micrograms of sele­nium daily for 14 weeks had improved lung function and were less sensitive to airway-constricting inhalants than when they were taking placebos (inac­tive pills).