Centrum and Flintstones multivitamins have known toxins in them and do more harm than good. Sodium selenite, for example, is a toxin commonly found in a multivitamin. Centrum is the number one most common brand of multivitamin recommended by doctors. Flintstones multivitamin is the leading children’s multivitamin. Bauer and Pfizer are the pharmaceutical companies making these multivitamins.