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Vitamin C improves breathing after exercise
After exercise, the airways can narrow, causing wheezing, coughing, and shortness of breath. Doctors become concerned when exhaled breath volume declines by 10 percent or more. About one in 10 experience this level of airway narrowing after exercise, and in winter competitive sports, up to half of participants may have symptoms.

Researchers analyzed three airway capacity studies that tested vitamin C or a placebo on a total of 40 exercise participants. Combining all results, compared to placebo, vitamin C reduced airway narrowing by nearly half.

Dosages used in the studies were 500 mg of vitamin C one-and-one-half hours before exercise; 2,000 mg of vitamin C one hour before exercise and, in the third study, 1,500 mg of vitamin C per day for two weeks.

Discussing their findings, doctors said these promising results suggest physically active people may reduce respiratory symptoms by taking vitamin C.

Reference: BMJ Open; 2013, Vol. 3, Published Online
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