You already know about anitoxidant vitamins, like vit C and E and beta carotene. Another whole antioxidant system is the glutathione peroxidase system. This especially repairs muscle cells. The other amino acid that supports the glutathione system is L-glutamine. This especially helps reduce muscle soreness after workouts.
Many people also take glutamine to prevent or stop protease inhibitor diarrhea.
You might also like to know that when glutathione levels are low, it seems that Hepatitis C replication and therefore viral load goes up. So yes, there are some smart antioxidant supplements to use for both your immune system and for muscle recovery. Meanwhile be sure you are eating a high protein diet as well, double the RDA for protein for a person your size. If you are 160 lbs, then 120 grams of protein a day. Read labels, notice that a 6 oz can of tuna has 42 grams of protein, a 8 oz glass of milk has 8 grams, a 9 oz box of frozen green beans has 3 grams.