Figure 1.

Vitamin D has a variety of effects in lung tissue; many of these are extremely relevant to asthma. As shown above, vitamin D plays critical roles in supporting the immune system, which may help prevent acute asthma exacerbations, decreasing inflammation, which may reduce acute asthma symptomology, reducing remodeling, which can reduce chronic lung dysfunction, and augmenting GC function, which may allow lower total doses of steroids to be administered.