One can safely take up to 100 grams of vitamin C intravenously as fast as it can flow out of the needle in one sitting. That high of dose would require taper off doses over the next two days though. The theoretical fatal dose would be over 350 grams however your body processes it very fast so it would be very hard to do according to Linus Pauling.
That's why I believe that vitamin C doesn't harm viruses directly - it's not aggressive and virus hulls are too similar to the hulls of our cells. Vitamin C helps our immune system to fight viruses (and the immune system has a ton of friend-foe detection mechanisms).
How much vitamin C do you "believe" is peak benefit?
100 mg per day is enough to saturate the storage capacity. The body gets rid of excess vitamin C fast and there must be a reason for that mechanism.
Maybe high-dose vitamin C makes sense to protect from oxidative stress during the early stages of an immune response. High-dose vitamin C induces a shift of immune responses from Th2 (against extracellular parasites) to Th1 (against intracellular bacteria and protozoa). This means that the usefulness of vitamin C depends on the pathogen the immune system is fighting against.
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