Asthma is a respiratory illness that is triggered by exposure to an improving gut health, supplementing with vitamin D or getting more naturally from the sun, . The daily recommended dose is about international units for adults, which. Asthma. Vitamin D. Vitamin D plays a crucial role in regulating a broad range of immune processes and anti-inflammatory reactions involved in asthma. Vitamin E. Vitamin C. Polyunsaturated Fatty Acids. Probiotics. Selenium. Zinc. Magnesium.