There’s a mountain of evidence that running is good for you. However, there are some some adverse conditions, like polluted air, that can cause lung injury and/or hinder performance. During the summer months, air in and around large cities often gets polluted with ozone, especially during heat waves, which can cause respiratory problems or even permanent lung damage.
But is there a way to prevent this without having to curtail outdoor fitness activities? Can vitamin supplementation, in particular, antioxidants like vitamin C or vitamin E help? According to: Effect of vitamin supplementation on lung injury and running performance in a hot, humid, and ozone-polluted environment:
These findings suggest that antioxidant supplementation might help to decrease the lung injury response of runners when exercising in adverse conditions, but has little effect on performance.
According to this study, it looks like these particular supplements may be helpful for decreasing the risk of lung injury(but almost no performance improvement), but it would be foolish for runners to start supplementing based on one small study. We need more research, and supplements aren’t without risks. If you want extra vitamins for their possible protective effects, eat more fruit. If there is an ozone alert in your area, it may be necessary to stay home instead of going out for a run, or to do a shorter run, especially if you have a pre-existing respiratory condition or lung disease.