Asthma sufferers who received vitamin D supplements for six months, in addition to their regular inhalers, could breathe a little easier than those who relied only on the inhalers, in a recent study in Iran.

The researchers say the results — if confirmed by larger studies — might help the many people who sometimes have troublesome asthma symptoms even though they use medication.

“It does build some on the growing amount of data that shows vitamin D might help those affected by asthma,” Dr. Mario Castro, who was not involved in the study, told Reuters Health.