i heard much much good things about lypospheric vitamin C. Some doctor who has a running practice said he stopped using IV vit C entirely cause lypo-C is as effective and cheaper and easier to administer, ofcourse.
the advantage also is that absorption is so high that you dont have to eat like 100 grams a day if you are trying to cure something... 10-15 grams is a pretty high dosage for lypo-C.
i know of two places that sells it, http://livonlabs.com/
and another one which i dont have the link to right now.
also available newly is lypospheric glytathione, and coq10, and some others....