Your liver is like your body's chemical processing plant. One of its many jobs is to filter or break down anything you take into your body. If you have hepatitis C, though, it may not work as well as usual. Things may stay in your system too long and affect you more strongly, or they may injure the organ.
To avoid problems, you might need to change what you eat and drink and the kinds of supplements and drugs you take.
Don't drink any alcohol unless your doctor says it's OK. It can speed up damage to your liver cells.
Street drugs in general are no good for your liver. For example, marijuana leads to faster liver scarring. And using a needle to inject substances can raise your risk of getting re-infected with hepatitis C.
If you're a smoker, you need to quit. It can raise the risk of liver cancer. Talk to your doctor about ways to break the habit.