Gretchen Reynolds, writing for the New York Times:
Of course, that theory is still unsubstantiated and requires long-term testing in people, Dr. Paulsen said. It is possible, he said, that smaller doses of antioxidants or different formulations might be useful for athletes. Meanwhile, natural antioxidants from food sources, such as blueberries and red wine, are unlikely to be problematic, he said. “It’s probably only concentrated extracts that are potentially dangerous,” he said. It is also worth pointing out that the volunteers who took the concentrated extracts of vitamins C and E increased their endurance to the same extent as those taking a placebo.
Interesting.