Vitamin E is a fat-soluble vitamin and antioxidant. Vitamin E is composed of the chemical compounds tocopherols and tocotrienols.
The health risk of too much vitamin E is low. The US Institute of Medicine has set an upper tolerable intake level for vitamin E at 1,000 mg (1,500 IU) for any form of supplementary alpha-tocopherol per day. Upper tolerable intake levels represent the maximum intake of a nutrient that is likely to pose no risk of adverse health effects in almost all individuals in the general population.
"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."
Vitamin E supplements come in softgel capsules.