New study questions vitamin D’s effects on asthma sufferers—but vitamin D supplementation did help asthmatics cut inhaler use. Low levels of vitamin D are thought to play a role in many medical problems, from asthma to osteoporosis to diabetes. Previous studies suggested that if you have asthma and low levels of vitamin D in the blood, you have worse lung function. This study is the first randomized controlled trial to investigate whether taking vitamin D supplements helps asthmatics by improving the breathing pattern. The study appeared online May 18 in JAMA.
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