A recent study, by researchers at the National Cancer Institute in Rockville, Maryland, found that people who said they regularly used vitamin E supplements (like some of the high quality colon cleanse supplements) had half of the normal risk of oral cancer of people who did not take vitamin E supplements.

Studies that have looked at blood levels of vitamin E have also found evidence of protective effects. British researchers, for example, found that women who had the highest blood levels of vitamin E had only one-fifth of the risk of breast cancer compared with women who had the lowest blood levels of vitamin E.