Vitamin C in high doses can have some bad side effects. I would be a bit wary at this point. There are limited studies if any at all that really show it specifically helping neuropathy.

High doses of vitamin C have been associated with multiple adverse effects. These include blood clotting, death (heart-related), kidney stones, pro-oxidant effects, problems with the digestive system, and red blood cell destruction. In cases of toxicity due to massive ingestions of vitamin C, forced fluids, and diuresis may be beneficial.