This isn't really a pro-vitamin article but I thought some of you might find the research interesting anyway:
[quote]In the new study, Morrow and Roberts determined the optimum antioxidant dose of vitamin E using an assay they developed to measure compounds formed by oxidative stress processes, called F2-isoprostanes. This measure, said Roberts, “has been independently validated as the best measure of oxidative stress status in vivo.â€