found some interesting things on vitamin c...
"I noticed that it was not entirely clear that the dramatic effects are always with ascorbic acid orally and sodium ascorbate intravenously. I have not been able to achieve the ascorbate effect with mineral ascorbates orally. Mineral ascorbates are fine forms of vitamin C but when you are really sick, the mitochondria are failing in their refueling of the free radical scavengers with electrons. The ascorbic acid carries 2 extra electrons per molecule where the mineral ascorbates seem to carry only one (plus per molecule the mineral ascorbates are heavier due to the mineral weighing more than the hydrogen the mineral replaces). So the mineral ascorbates are not potent enough to accomplish the ascorbate effect. There may be other reasons that we do not appreciate additionally. " - Robert Cathcart, MD.
also there is a difference in ascorbic acids.....
http://www.antiaging-systems.com/extract/vitaminc.htm
this article states that the l-ascorbic acid is the only beneficial form, and the d-ascorbic is just a waste.....so i go looking for bulk powder online and i see this site....
http://www.msm-msm.com/bulkaa.html
as you can see they sell it for 10bucks a pound, but look at the last sentence, "Please note that this item is not L-ascorbic acid"