>>helps to limit free radicals
Yes, likely it does. But that begs the question of whether limiting free radicals is always a good thing. The immune system actually uses free radicals in a controlled fashion, and perhaps the reason that supplemental vitamin E seems to be bad for prostate cancer (and lung cancer) is that it is interfering in some way with the body's immune surveillance and destruction system.
I don't think I've ever seen a single convincing study showing supplemental Vitamin C is good for anything.
My intuition is that the reason fruits and vegetables (particularly the weirder ones) are good for you is that they contain both anti-oxidants and phytochemical stressors - basically low-level toxins that plants have developed in their fights with insects, funguses and the like. So stuff like garlic, ginger, curcumin, pomegranate, peppers and cruciferous vegetables are all packed with active phytochemicals that do seemingly good things, at least in vitro and in observational studies.
Studying this stuff is impossibly hard though, so there is not much hard evidence for any viewpoint.
Peter
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