Hi Cathy,
This is a confusing subject! Antioxidants include a HUGE category of nutrients. To name a few common antioxidants I would include Vitamins A, C, E, Curcumin, compounds in Garlic, resveratol, Lycopene, Beta-carotene, etc. There are so many compounds. Generally speaking, I don't have my patients on chemo and/or radiation take high doses of supplemental antioxidants but generally encourage a diet rich in fruits/vegetables, whole grains (plant based diet). The rational is that we don't get such high doses in diet form as we might if we take supplemental forms.
Here are a couple of websites I like regarding the topic.
http://www.nlm.nih.gov/medlineplus/antioxidants.html
http://www.mskcc.org/cancer-care/int...other-products
Best Wishes,