This interesting article appeared in the NYTimes which seems to contradict other studies on vitamins an exercise. We probably have a very simplistic view of the role of free redicals in the body. Obviously, free radicals and reactive oxygen species-despite their bad press-are, in fact essential to life-the question is, is too much of a good thing bad? This study seems to suggest there is a beneficial sweet spot of physiological oxidation/reduction below which, or beyond which, the body is harmed.