Lycopene is an antioxidant carotenoid (like beta-carotene) which is the source of the red coloring of tomatoes, red peppers, red grapefruit and watermelon. Interestingly, the bioavailability of Lycopene is increased following cooking – so processed tomato products such as ketchup, tomato juice and pizza sauce have more bioavailable Lycopene than do fresh tomatoes.
Lycopene supplements are available as softgel capsules.
"A few small clinical trials suggest that specific antioxidants from diet or vitamin supplements might improve asthma control or lung function in asthmatic children or adults."
Some studies have found that oxygen free radicals have a causal role in auto-immune diseases, such as rheumatoid arthritis (RA).
However, a report by the Harvard School of Public Health, found that "Randomized, placebo-controlled trials—which, when performed well, provide the strongest evidence—offer little support that taking vitamin C, vitamin E, beta-carotene, or other single antioxidants provides substantial protection against heart disease, cancer, or other chronic conditions. The results of the largest such trials have been mostly negative."