Hi, Velocity! Welcome to the forum! I have hep C, genotype 1, stage 3. I was diagnosed in '93. Before trying Interferon (the only treatment available at that time), I tried milk thistle. The printed info I was given, by a friend with hep C, stated that no carbonated beverages were allowed, no coffee, etc. There were a lot of things to be eliminated in combination with milk thistle ingestion. I only took it for about 6 wks. (and didn't give up soda or coffee, etc.) and my liver enzymes actually rose. I also had diarrhea from it and it burned my behind. However, the friend who had given me the info on milk thistle, was said to have eliminated the hep C from her body.
I would also advise checking with your hepatologist to see if he/she considers it harmful. If not, then it's up to you...unless you are currently taking the approved treatment. Have you, or are you now, on treatment? If so, then it may be contraindicated.