Can you have too many antioxidants in one day?

Yes. Some antioxidants are water soluble and will just leave the body through the urine however some are fat soluble and too much of these can be harmful. Too much vitamin c and magnesium can cause loose bowels but are not dangerous unless you keep taking them and become dehydrated.
Yes, VitE & beta crt. Although dietary and reasonable supplement intake of anti-oxidants is a good thing for your health, too much can be a problem. Cleveland Clinic researchers published a study recently showing that excess beta carotene can actually increase risk for cardiovascular disease. Other studies have shown a link with increase cancer. Vit E also can be excessive & cause bleeding.