Are you wasting your money on supplements? Most likely, experts say

(CNN) Vitamin, mineral and multivitamin supplements aren't likely to protect you from cancer, heart disease or overall mortality, the US Preventive Services Task Force said in updated guidelines released Tuesday in the journal JAMA.

Since its last recommendation in 2014 , the task force reviewed 84 studies testing vitamins in almost 700,000 people, including 52 new studies on the topic.

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.

Nor should people take vitamin E "because it probably has no net benefit in reducing mortality, cardiovascular disease, or cancer," the task force said.