Having hepatitis C in and of itself does not mean you cannot take fish oil. However, all supplements should be checked with your doctor, as there are some conditions and medications that should not be combined with fish oil use.
It's been okayed by my doc.
I'm not aware of any problems with fish oil and hep c. I do know additional iron is not recommended for anyone with hep c. If in tx for hep c your doctor will advise you on any medication, and supplements to take or not take while in tx.