3. Preventing Heart Disease

One of the most popular claims about multivitamins is that they help prevent heart disease. Despite conflicting studies, the consensus is that multivitamins do not, in fact, offer this benefit. One of the most important studies was the Physicians’ Health Study II, where over 14,000 doctors investigated the daily use of multivitamins and placebos for over a decade. Their results found no reductions in strokes, heart attacks, or mortality. In 2018, Circulation: Cardiovascular Quality and Outcomes published a meta-analysis of 45 years of multivitamin studies and the effects the supplements may have on various cardiovascular disease outcomes. They found that multivitamins don’t improve cardiovascular outcomes in the general population.

cardiologist heart research Steve Debenport / Getty Images

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