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Many antioxidants suppress the production of various cytokines during exercise. This has been well studied and is generally accepted. However there seems also to be a positive link between said cytokine production and muscle growth, i.e. while antioxidants may reduce inflammation resulting from exercise, they may also inhibit the hypertrophy of damaged muscles. It has been generally accepted that chronic use of NSAIDs for muscle pain inhibits hypertrophy due to the suppression of the factors which create inflammation. This latter has been my experience.

Thus I used to take 1g or more of Vitamin C per day until I saw a post by, IIRC Machka, that Vitamin C supplementation had been found to be negatively associated with endurance performance:
Oral administration of vitamin C decreases muscle mitochondrial biogenesis and hampers training-induced adaptations in endurance performance
I immediately dropped it from my supplements and if anything my muscles were less sore and endurance performance better. Certainly not worse. I was advised to take the antioxidant alpha lipoic acid (ALA) for my age-related macular degeneration, but that particular antioxidant has been found to have no effect on interleukin-6, an inflammatory cytokine released by exercise. http://www.academicjournals.org/jour...f/52B9D9E30666