Yep, This is the advice I was given when I was undergoing treatment--take no supplements except a multivitamin (which I esssentially got in my day's worth of "Jevity" consumption once I was usuing the tube).

But I was under the imporession that the logic of that was just that antioxidents could actually protect the cancer cells--the way my MO exaplained it was that both chemo and radiation kill cancer cells more easily than normal cells because the cancer cells grow at an abnormal rate--if antioxidants slow the growth down, the treatment may be less effective.

But this article sumarizes some research that suggests antioxidants aren't good to take in large doses at any point and could actually increase cancer occurences over time, even when you have no cancer to begin with. That's new and a little disturbing.

Obviously there's a lot not known still!