Garden of Life, Nature's Way and Rainbow Light offer some of the best consumer multivitamins on the market, according to LabDoor. Of the three, Garden of Life was ranked the highest for safety and purity.
One of the most important factors in selecting a multivitamin is label accuracy. According to a report by MSNBC, as many as one in three multivitamins misreport their contents, and the reported concentrations can vary wildly.
Taking large doses of vitamins has proven ineffective in preventing cancer and heart disease, reports The New York Times. In fact, extremely large does of vitamins can actually prove hazardous. As such, multivitamins that contain reasonable amounts of vitamins and minerals are preferable over mega-dose supplements.