http://www.healthcentral.com/asthma/
Studies suggested that vitamin D deficiency may aggravate asthma symptoms in adults and that supplementation might help reduce them. Recent research evaluated 408 adults with asthma; 66 percent were vitamin D deficient. Half of the group received vitamin D3 tablets for 28 weeks. The remaining participants took a placebo during that same period. In addition, all patients used the inhaled corticosteroid ciclesonide to control their asthma. http://www.healthcentral.com/
Ultimately, there was no difference in the time to first treatment failure-defined as a decline in lung function, an increased need for asthma medications or an asthma-related hospital visit-between the two groups. The investigators did report one small benefit: Vitamin D users needed slightly less ciclesonide to achieve symptom control, but the difference was not significant.
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