Today in my 4th year pharmacology class, it was stated that there is proof that vitamin C is a viable "drug" to combat the onset of a cold/virus. It was said that by 2011 it might even be a medical regiment. This is just some info for those of you/us that mega dose when we're feeling down, or on a regular basis. I know I take about 12g everyday. "Mega dose" that was given was only 10g over a 24 hour period, dosed accordingly.