At that time I thought it must be too acidic and changed to buffered C and that solved the problem. I have used the sodium ascorbate before so I bought it again.
Edit: I remember now I got my information from Owen, he was a very active poster. Check under Nutrition the last paragraphs under Vitamin C. He got his info from Dr.Levy.
http://owen.curezone.com/healing/healingindex.html