Studies with vitamin E and beta-carotene as single agents do not prove lack of benefit.
Firestone
Raymond A
RA
D002318:Cardiovascular Diseases / Q000517:prevention & control*; D004032:Diet; D006801:Humans; D009369:Neoplasms / Q000517:prevention & control*; D014810:Vitamin E / Q000627:therapeutic use*; D019207:beta Carotene / Q000627:therapeutic use*
D019207:beta Carotene; D014810:Vitamin E