[an-tee-OX-uh-dunts or an-tie-OX-uh-dunts]
compounds that hold back chemical reactions with oxygen (oxidation). Some vitamins, such as vitamins C and E and beta-carotene are antioxidants. Antioxidants that are found in foods might reduce the risk of some cancers. But taking certain antioxidants as supplements has been linked to higher cancer risk in some people.