If I get a cold (which is rare) I go for the high dose vitamin C method where you take the daily recommended dose every hour till you get a gurgly stomach feeling. I literally felt a little better after each dose and my last cold only peaked for a few hours till I vitamin C'd it away!
There was a really good paper I read about it recently that explains it that I can't find but I pulled up a couple of other articles:
http://www.sott.net/article/201592-High-Dose-Vitamin-C-Therapy-Proven-Effective
http://www.livestrong.com/article/413359-what-are-the-benefits-of-mega-dosing-vitamin-c/
http://www.sott.net/article/254526-High-dose-IV-vitamin-C-kills-cancer-cells
There was a really good paper I read about it recently that explains it that I can't find but I pulled up a couple of other articles:
http://www.sott.net/article/201592-High-Dose-Vitamin-C-Therapy-Proven-Effective
http://www.livestrong.com/article/413359-what-are-the-benefits-of-mega-dosing-vitamin-c/
http://www.sott.net/article/254526-High-dose-IV-vitamin-C-kills-cancer-cells