The US Government has done some research (1998) on Vitamin C as an antibiotic and found that it works.
This study has shown that 4 weeks daily high dose vitamin C treatment in H. pylori infected patients with chronic gastritis resulted in apparent H. pylori eradication in 30% of those treated. In those patients there was also a highly significant rise in gastric juice total vitamin C concentration which persisted for at least 4 weeks after the treatment ceased. A significant, though less marked, gastric juice total vitamin C concentration increase was observed during vitamin C treatment even in subjects with persistent H. pylori infection, though this was not maintained after treatment ended. The mechanism whereby vitamin C treatment appeared to result in H. pylori eradication is unclear. Further confirmatory studies are indicated.The studies used a dose of 5 grams a day. I'd like to see a much higher dose used (20 grams a day) and see if that didn't work for a larger percentage of the population.
Of course this study says nothing about Vitamin C and the common cold. Because the common cold is caused by a virus. Still, because of its low toxicity it couldn't hurt.
H/T alexjrgreen at Talk Polywell
Cross Posted at Classical Values