Stop taking vitamin C and E if you exercise? I do not believe that headline from the first link and I hope you will learn enough from the attachment below to discredit such flimsy research.
There is extensive valid research for many years finding benefits and now this inadequate study gets headlines everywhere. The media has to sell their stuff and this will get read because it makes readers believe that continuing their supplements may be putting them at
some risk. That makes this nonsense sell papers.
Obviously those on any of the supplement programs I recommend are never receiving JUST C and E. Anyone looking for even a few seconds will see things like MSM, Resveratrol, Essential Fatty acids like Omega 3 and Primrose and Amino Acids and herbs like garlic and chelators like EDTA.
I have attached an important link to help you refute this poor study if it comes up with your patients or colleagues. Dr Alex Schauss is a long-term friend and imminently qualified to rebut this attack on Vitamin E and C on a strictly scientific basis alone.
There seems to be more funding for research attacking nutritional supplements than any support for studies seeking to find positive benefits.
#1 http://www.nutraingredients.com/Research/Vitamin-exercise-study-questioned
Link #2 provides another useful reference on Vitamin C. It provides further information regarding the effects of exercise role of Vitamin C, which they find is contradictory in the published research.
I prefer to consider how to optimize human performance with a total nutritional support program where any potential issues raised about vitamin C supplementation alone are overcome by the benefits from the other ingredients from Selenium and Lipoic Acid to Garlic and EDTA.
#2 http://www.exrx.net/Nutrition/Antioxidants/VitaminC.html