The upper limit for vitamin C intake is 2000 mg/day. Up to 10 g/day of vitamin C are sometimes taken for unproven health benefits, such as preventing or shortening the duration of viral infections or slowing or reversing the progression of cancer or atherosclerosis. Such doses may acidify the urine, cause nausea and diarrhea, interfere with the healthy antioxidant-prooxidant balance in the body, and, in patients with thalassemia or hemochromatosis, promote iron overload. Intake below the upper limit does not have toxic effects in healthy adults."
Linda, I hope that you are using a buffered form of vitamin c(ie. calcium or magnesium ascorbate, as huge amounts of acidic vitamin c, especially when taken on an empty stomach might cause a problem. Vitamin c is also an anticoagulant. If you also take large amounts of vitamin E with it, you might develop a problem with slow clotting.
