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If you have exercise-induced asthma – where you cough, wheeze or have shortness of breath only while exercising – pop a vitamin C beforehand next time. 20% of people who DON’T have regular asthma have trouble breathing during exercise – especially in cold or dry air. If that’s you, taking a-thousand milligrams of vitamin C an hour before spin class will help keep your airways open. That’s because vitamin C relaxes blood vessels and lowers stress hormones – both of which can help airways stay open.