humanshell- its gonna sound corny cuz this company gets teased sometimes, but Amway makes a great multiple and antioxidant supp (I take the multiple). The line is called Nutrilite. These were recommended by several of my coworkers at the gym. These people are well respected in our field (a master's level dietitican, and several master's level trainers and strength and conditioning coaches). They do plenty of research on the subject and say the research shown by this company is excellent as far as quality is concerned.
I'm also taking twinlab's antioxidant fuel. They are another company I feel has high quality standards. They also make multiples and separate e and c supplements.