Have a bit of knowledge from reading literature during my uni days on vit C. Hope this helps. Vit C is a powerful antioxidant and can combat the free radicals that can build up during heavy training and day to day life, so in this respect it is very good training aid. However the body will only absorb what it needs and will therefore not ever require 1850% RDA (its not a case of the more you recieve the more powerful the response). Vit C is a water soluable vitamin so will just be excreated from your body. In addition although it is still a debated point, its more likely that the body can absorb vitamins more effectively in there purest form i.e oranges, kiwis and the like. Suggest you up your fruit intake and give your poor intestines a rest.