A review of the evidence finds little proof vitamin supplements prevent cancer or heart disease.

... report in the Annals of Internal Medicine . Beta-carotene can raise the risk of lung cancer in smokers, and vitamin E does no good at all in preventing cancer or heart disease. "The USPSTF concludes with moderate certainty that the net benefit of ...

http://www.nbcnews.com/health/vitamins-dont-prevent-heart-disease-or-cancer-experts-find-2D11577445