I have also used high doses of Vit. C (1000mg every hour until I get diarrhea) usually that is 4000mg or 4 Gms. When I first heard a doctor recommend it to a surgeon who had a really bad cold starting, and a huge bowel resection to do the next day, I thought he was crazy. He also recommended cutting a lemon up and putting it, rinds and all into a pot of tea with honey, and drink that throughout the day. The surgeon came in the next day, and it was like he didn't have a cold at all, and he had not taken any medications other than the Vit. C. I have used it ever since, when ever I get the hint of a cold and it works every time. This has been for 10 years and I have only had 1-2 actual colds since, and it was when I didn't do the routine. I also suck on zinc lozenges.