Those with less than sufficient levels of vitamin D are significantly more vulnerable to upper respiratory infections. This includes sinus infections and colds, and lower respiratory infections, like bronchitis and pneumonia. Those with adequate vitamin D levels experienced fewer complications during hospital stays and after surgeries.
Vitamin D levels at or above recommended levels are associated with more efficient immune function and decreased respiratory inflammation. With decreased inflammation comes decreased incidence of infection and decreased occurrences of asthma.

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