Yet the conclusion remained the same as that of 2014: If you are a healthy, nonpregnant adult, there is “insufficient evidence” of any benefits to extending one’s life in taking vitamin E, vitamin D, calcium, vitamin A, beta carotene,vitamin B3, vitamin B6, vitamin C and selenium. However, there is enough evidence to recommend against the use of beta carotene supplements, which the body turns into vitamin A, to prevent cardiovascular disease or cancer “because of a possible increased risk of mortality, cardiovascular mortality, and lung cancer,” the task force said. There is a lack of evidence that vitamin and mineral supplements reduce mortality, according to the US Preventive Services Task Force.