I'd suggest you to review the current science literature on this subject as it so far it's starting to look bad for proponents of the "You need more vitamins"-campaign.

Antioxidants Could Spur Tumors by Acting on Cancer Gene http://www.sciencemag.org/content/343/6170/477.summary

Supplement Alert: Antioxidants May Protect Cancer Cells Instead Of Protecting Us From Them http://www.forbes.com/sites/daviddisalvo/2014/02/08/suppleme...