No clinical study has ever shown that massive doses of vitamin supplements can help bring about any sort of preventive effect against cancer and other chronic diseases. The results of numerous studies carried out on this field have pointed instead in exactly the opposite direction there is an increase in the risk of death associated with taking high doses of vitamin supplements. example, two studies done on the effect of high supplemental doses of vitamin A or betacarotene on the risk developing lung cancer for smokers showed that the daily sorption of this vitamin does not reduce their